Let your heart be your compass and knowledge be your candle. We won't get lost, love always wins. It might take lifetimes but it will win. One love, one family, one planet and only one you!
I really love when reality trumps common sense. At the beginning, I considered the dangers being raised to be very, very plausible. As you began to test them out, I was cringing inside, waiting for a strong reaction leading to disaster. What a cool video. Thanks so much!
B75; You are going to get in the center of the magnet. Magnet; na, I don’t feel like it. B75; I’m telling you, get there, now. Magnet; I told you that I don’t want to. B75; I don’t care what you want, right now. Go! Magnet; make me. B75; goooo Magnet; clump B75; come on back, let’s try it again. Magnet; no, you can’t make me. B75; come on, I’m tired of this. Let’s go. Magnet; nnnoooo B75; oooooooooooooooooo, that’s it don’t make me come back here with my stick. I will do it. Magnet; mmmhh B75; you have till the count of three. One, two, Magnet; you will not make me move. B75; come on, I got you. Come on. B75’s back; this is tough. I don’t think it wants to come. Let’s give it a minute. B75; no, I aallllmmmooosst have it. Come on legs. Put some work in. Magnet; nnnnnooooon nnnooooonnnnooo B75; ooooffff, I got it.
5:30 there are safe shoes without steel. For various reasons, steel is now being replaced with other material. The root issue is that steel is a shape memory material, and we now prefer that, once the deformation point is reached, material do not bend and punch the foot with permanent memorized pinched, but we prefer the materials to just break. Broken shoes are easier to extract. Pinched shoes are very difficult to remove at hospital, and once you know the energy involved passed any reasonable value, doctors prefer removing parts of shoes rather than having to grind steel literally glued to skin. I don't know if materials are derived from plastic, glass, or carbone.
that and steel is expensive, random other materials are cheaper to produce so therefore bigger profits for the companies. Steel toes are superior in maximum performance but honestly if you're dropping nukes on your toes, you're doing something wrong.
Carbon Fiber, Fiberglass, and various polymers are pretty common. i think the CF and FG would be the best options since you can actually wrap them into the sole a bit to create a sort of toe box that's much more durable than just a toe lid or toe hat.
Actual steel toed boots are indeed getting more rare. Since they are frankly worse. (some insurance companies don't even regard steel toed boots as safe, and won't cover medical costs if such were used.) Composite shoes with fiber glass, carbon fibers, or at times Kevlar are all more light weight, non magnetic, and cracks when overburdened instead of deforming. It is far easier for crushed toes to heal if not encased in a few mm of steel. And a lot of composite shoes are even stronger than steel ones, especially as far as weight is concerned. Composite shoes are though typically more expensive than steel ones, since making composites is more labor intensive then forming a piece of steel. (and steel is also cheaper than composites from a raw materials standpoint) There is also plastic reinforced shoes, these are also much cheaper than steel, however less strong. But for a lot of lighter applications these are strong enough, while having the advantage of not encasing toes in hard to remove material.
@@GameTimeWhy ... based on basic materials science? you fucking spergerstein? If carbon or plastic was better than steel, they would use those to make buildings, not steel beams. The two problems of steel toes is weight and irremovability once it *does* get crushed. But it's yield strength is the highest of all other offered materials.
@@awesomeavis7861 Because both are round, there's literally a point contact and it's hard to see in motion. But they're definitely connected at all times.
I think we would either need the raw uncompressed footage or a slow motion camera to confirm this, the problem is that if the plates would seperate, the Magnetic force would decrease by the square of the distance, and the centrifugal force would increase as they sepperated, and because they are not connected and no change of medium there should only be a decrease in magnetism as the magnets begin to seperate. After reviewing it in this fasion, I too believe its an illusion created by video compression and or the camera itself. I do not think they ever sepperated, and if they did, it would be Very brief and as a result of vibration, not centrifugal forces, soemthing that only a slow motion camera could catch it.
You just explained it by yourself: Ferromagnetic objects try to align alongside magnetic field lines, which are vertical at the magnet center and horizontal at the edges.
Yeah, you came up with the same explanation I did, essentially. You put a ferromagnetic material up against a magnet, it becomes a magnet itself. Which means for long objects, the far end is the same pole as the face of the magnet and they'll repel each other. This is why paperclips stand up. For the lying flat scenario, you'd have to absolutely perfectly center the weight under the magnet and have it be perfectly parallel to the magnet as you bring them together. Any variance at all would cause it to polarize the closer side as opposite to the face of the magnet and the far side the same, force it it upright.
I think it looks strange enough even when you know there's a magnet. And also I think it would be impossible to see without realising that there must be a magnet.
Brilliant! 😀 the clip of you doing the reverse weightlifting gave me great laugh. Stay safe and remember to degauss your weights before your next session 👍😀
"Remember to like, *and maybe even subscribe* " That's some good ol' fashioned humbleness right there. I respect youtubers who don't throw the request in your face, or try to guilt trip you, ect. Your content is very reliably good, so a sub is a no-brainer. Keep up the good work!
Yeah your explanation sounds correct, it's exactly what I was thinking when I saw the weight flip up and the two bottoms instantly repelled one another.
Damn. That's a nice question. Got me thinking... This is my take on it 🤔 I'd think it would still be the same. Though the fieldlines at the side are more going sideways and to that are more dense. So adding a flat metal on the left side, many field lines pass through the left side of the metal in an almost parallel manner to the metal. Only few field lines are in the opposing direction on the right side of the metal. So I'd say, the left sides attraction overpowers the repulsion of the right side.
Maybe the weight ‘conducts’/refracts/redirects’ the field lines convergence points. If each line has areas of N and S along it…then perhaps it could be that as these parallel lines approach so too does the attraction between them.
I get in enough trouble with small Neodymium magnets. You can also see this in the videos of MRI magnets that are being decommissioned. The various metal objects released near the magnet stick out instead of being pulled flat against the magnet. Search _magnet quench_ for hours of entertainment.
@@hughbrackett343 I was less worried about he LN2 and more worried about the straight O2 mixed in there as if you were doing a quench in a true emergency, I think liquid air is a flamibiblity hazard. I'd hate to hear about a piece of electronics getting sucked onto a patient so they quench and a fire breaks out in the room... that's nightmare fuel
I would be interested in seeing you test the snap force, using a hand/finger made out of ballistic gel & bone. A good visual of the possible danger to hands/fingers.
I am taking a Physics class right now and the one thing that my physics professor would say is that there are no monopoles. When you magnetize an object (or creating a temporary magnet by introducing the iron to a magnetic field), you are creating an object with both a South and North Pole. The paper clip and the weight do not want to lie center of the magnet because their temporary poles are repelling them against the magnetic poles. This causes them to align themselves with the magnetic field in the direction with the largest decrease in magnetic strength, in this case vertically. At the edge of the magnet, there is a large decrease in magnetic strength between the center and outside where that magnetic field curves from parallel to the edge to the center of the magnet. The induced magnet in the iron makes it really easy to align the metal to the edge of the field.
I recognized this phenomena over a decade ago, using things like paper clips, nails, and other objects. Your graphic explanation is exactly how I rectified it in my mind back then, so I believe you're 100% correct in your analysis. Now, where things would go terribly wrong, and you would lose digits or eyes, is if you tried putting another similar magnet under the table! Then things would happen exactly as others feared, and it would snap flat and center, or if two, they would snap together in either direction dependent upon certain variables. Needless to say, it would be foolish to even try! Absolutely love your videos... Edit: btw, I'm guessing you can take those washers or paper clips, and easily lay them flat along the edge of the magnet face...
Lovely, These videos are always so entertaining and I can watch hours of this stuff , in fact I liked it so much I have some strong magnets of my own! (weak to yours lol) and your explanation seems correct one of my favorite videos.
This is because of the Demagnetization Field. This term and its explanation can be found in litterature and in most books on magnets, like Blundell's book on Magnetism. In this example, when a magnet is flat in one dimension, the H field between the two imagined "Magnetic charges" on the top and bottom layers cancels out the Magnetization field, M - because they go in opposite directions. For long objects, the "magnetic charges" are far away from each other, thus the H field inside the magnet is small, and a large Magnetization can occur inside, which was what your simulations showed. When simulating and calculating this effect, you will need to specify the Demagnetization Tensor, which gives tells how much the magnet Demagnetizes itself in different directions - the shorter the magnet, the larger the Demagnetizing effect.
The explanation is very counterintuitive to what most people understand about how magnets work. A number one rule in physics is that magnetic fields can't do work. On its face, this seems to fly against everything we know from practical experience. However, what generates the forces that we normally experience when we play with magnets is actually the magnetic field gradient. In this case, your supposition is correct. When the dumbbells are oriented edge on the gradient is very strong, which induces a very strong corresponding magnetic field in the iron. This feedback pulls additional field lines in until it reaches equilibrium. When it's parallel to the surface though the magnetic field gradient is very weak, and therefore induces a very weak field in the iron.
The easiest way to analyze it is probably in the context of equivalent magnetic circuits. I don't have too much experience with them, but I believe what's happening is that the weight is moving into the position which minimizes the magnetic reluctance. There's a lot of good info online about magnetic circuits.
Great video as always. Like others in the comments, I would enjoy seeing that magnetic field program depicting a flat weight offset from the center of the big magnet, for comparison, if that is possible.
I like your other videos where you respectfully warn viewers of the various potential hazards associated with the content, but never assume that they are not capable of coping with them on their own. I click away from other videos when they assume somehow none of us are as capable.
whats interesting to note is the weight reduction while under the effects of magnets while swinging. if polished surface might swing for every. great content sir
I experienced this phenomena about 30 years ago. I played around with my keys outside a NMR cryogenic magnet and discovered that the keys were pulled towards the magnet along the magnetic field lines, but following the lines around the keys now pointed away from the magnet while pushing against my finger... I kept a very tight grip of the ring holding my keys. :-) To explain any physical system, just look at the energy in the system. For this case, when the object aligns along the magnetic lines the energy is locally minimized. If you want to turn the weight there is a energy penalty to overcome. If the system is in a stable state you have to add energy (force x distance, poking with a stick) until you reach a maxima and the system can drop down into the next minima of the system. In my example of the keys and in your video it means that the object is in a local minima and can't turn as it requires more energy than the system possess. Adding energy in the form of violently shaking things could bring a system from a local minima into a deeper global minima. The other way around is harder. I've been too long-winded, so I just say, Nice video! :-)
The way I look at it is that the permanent magnet induces a dipole EM field into the iron weights, and the most stable self-organizing configuration is where the poles of that induced field have the maximum possible separation. Pushing the weight flat forces a metastable state around a local potential mimima and the quick flops represent the local maxima where the configuration slips from one energy well to another.
When i think about it, all i could think of is how the magnetic field spins around its edge and go through the center densely and straight down, therefore grabbing the also-vertical magnetized object in a better position. It seems i was kinda right, but thanks alot for the color/visualization of it! 👍
Your theory makes a lot of sense to me. I have a theoretical experiment that could be performed in order to test the theory. Place the magnet so that it is at a 90° angle from your usual positioning on top of the table. Slowly bring the barbell weight towards the bottom of the table first in the usual perpendicular to the ground and then parallel to the ground. And we'll see which orientation has the stronger magnetic attraction.
It's so counter-intuitive because just looking at it, we assume it to behave like gravity, which (I believe) behaves in straight lines. But magnetic fields aren't straight lines, and the poles don't act like mass.
I am amazed at how little we understand these things. We can describe them so accurately, but no one can explain a "mechanism" of cause. That kills me, and most don't even see the difference between "what" it does and "why" it does it. And then, magnetic lines do not exist, but most people think they do. The lines come from our attempt to describe and visualize, but the field itself is smooth and homogeneous. The spikes in the fluid come from how mass channels the field around other mass, not from the field itself.
It's a function of the Surface area that interrupts the magnetic field, and total distance the field has to travel through the material, and the material's magnetic permeability. Think of how magnetic chucks for CNC machines work.
It has to do with the shape of the magnetic field. It's stronger near the edges and in the center. Depending on polarity, the field will flow up from near the edge on the face of the magnet, and flow towards the middle, or the other way around. This means that it wants to "short" the magnetic field through the metal you use. This poses a few different issues: 1: the material is saturated by magnetism, and is partially attracted to the magnet, but also repelled, much like the experiment of having 2 metal strips hanging, charged at the same high potential will repel. 2: for the weights with a hole in the middle, you'll likely still have the same issue as above, but it's likely made worse by the fact that you have a hole in the middle, where the opposite polarity to the edge is. If you had a thick cylinder without a hole, that has enough mass and capacity to not be saturated by the magnet, it would likely happily stay in the middle. If it does not have the magnetic capacity, a chunk of metal that big, might just flip the magnet in stead.
I wrote a 10 page assignement on magnets a while ago. Your explanation as far as i know is correct. Though the resistance to flipping aweight is not only due to the repulsion but also because you move the weight through and out of the fieldlines. Though i'm not a 100% on that part.
I was about to write something "because in a flat position the field would become an unstable mess", but you've demonstrated it in a sim. The magnetic lines that would form in a pancake will not form a good magnetic dipole, instead having poles scattered as rings god-knows-how. There is a big difference between being a magnet, which is best flat, and being magnetized. The reason there is no scientific papers on that problem is probably because it's quite straightforward. It's enough to consider 2 things: 1) Magnetic field can represent potential field by sort-of-inversing curl. 2) Everything in mechanics wants to achieve the maximum drop in potential energy possible, given the initial conditions (see Euler-Lagrange equation). Or everything follows the path of the most drop in potential. From those two, an axis aligned flat object on a magnet would experience the least possible potential (field) drop. There are neighboring positions with higher drop and the object will try to jump to them. This is as plain as putting two spheres one on top of another: the position is unstable and the top one will roll down. Lying flat off-axis over the edge of the magnet is also stable, although less stable. That creates a crisscross pattern for the poles in the magnetized object where the hanging part of the object is attracted to the side of the magnet, because it is polarized in reverse and wants to attach itself to the side.
Magnetic shape anisotropy will always prefer to magnetize the material in the longest direction possible. There will be less domains compared to other directors and will always be the case unless you're dealing with single crystal materials
In any arbitrary configuration of magnets and ferromagnetic objects, the force always is in the direction that increases the total magnetic flux. The flat disk of iron on a pole increases the total flux just a bit, but any tilt increases it even more. So the flat approach is not stable. If the disk were perfectly constrained to move only along the axis of the magnet, it would be weakly attracted. But the slightest tilt would produce force that increases the tilt.
Within the magnetic field of the neodymium magnet, the weight becomes its own magnet. I my opinion, it's a question of geometry. The same poles on a magnet want to be hella far from each other, so any object placed towards them should line up in a stable and long orientation.
Thanks for showing all this neat stuff. Could you please do a video where you show the magnetic axial flux lines with ferrofluid, and then rotate the magnet around that axis? This would visualize the Faraday paradox, that still today isn't fully accepted or understood. A rotating stand with a monster magnet on top - a glas bowl of ferrofluid would do the trick? 😇
I don't know much about permanent magnets other than the iron filings experiment I did in school (well also things like the curie point and stuff) though I was about to sketch out the exact same thing in your simulation. It's easier to picture in my head but because the field lines extend out almost perpendicular to the magnet they'll 'interface' better with perpendicular objects. Edit: You explained it better.
i've always known objects will be forced into alignment with the magnetic field's directions, but i've never really thought of it this way. its the same reason that when you sprinkle iron dust on a magnet, it doesn't all clump tightly to the magnet and instead forms peaks along the field's vectors. there is probably a formula correlating magnetic flux vs moment of inertia in regards to the shape of things and their mass being affected different ways.
During the video, my speculation was also that it had to be related to the direction of magnetic field lines, where the illustration with a paper clip is more illustrative with the much larger size difference, that it is actively pushed up. Appears that the magnet does not like the lines "trapped" in the metal object being bent too much.
i just BURST out in lauthter at 5:12 - no joke you're a creative t(h)inker :D and i havent even finished the video yet! this is why i love your channel!
iron is not only attracted to a magnet, but it also becomes a magnet itself. It couples to a nearby magnet and reshapes the field giving rise to another pseudo N & S pole. I've been loosely trying to make formula for this.
What was interesting was how instantaneous the weights jumped into position to align themselves with the magnetic field, as if their mass was completely negligible. Did they even conform to the standard rules of inertia and F = ma? From the video you could estimate the force on the weight to make it jerk move that fast (and jerk to a stop).
Great video, I agree with your assessment here. I would also note that the demagnetization field lines that goes through the cast iron pass through itself to a higher degree when the poles are at the surface of the rings rather that the ends. To what degree, and whether that actually matters on this scale is debatable. FEMM only does 2D as far as I understand. Have you considered modeling in 3D to take the geometry of the magnets into account?
Magnetic reluctance (path of least resistance must consider material saturation), no monopoles exist and the fundamental understanding that opposites attract, it's actually pretty simple... path of least resistance with consideration of material saturation and the resultant forces of the object becoming magnetized are what is causing the "weird" behavior, it's two factors being balanced so to speak. When a material magnetically saturates flux basically hits a brick wall as reluctance skyrockets and flux starts finding a less resistive path that will interact with the saturated material. The tipping points (where the action happens) is when one of the factors is more heavily favored, causing a polar swap and things rapidly change to a less resistive state as part of the magnetic flux path. With this understanding we can make a testable hypothesis that an object length will determine the "standing up" effect due to the distance from the magnetically saturated material (now a N-S magnet ) polar opposite interacting the remainder of magnetic flux from the magnet that's not flowing through the saturated object. In short, the wider magnet will stand up a taller object.
One aspect of the geometry you didn't explore further was that all of the pieces you experimented with were toroidal (have a hole in the middle). That air gap may also play a role in the magnetic fields preferred pathway. It may be easier to center a solid disc vs a donut. I still believe the preferred orientation would be to hang but it may not snap off center as consistently like the barbell weight.
It's because the cast iron discs are concentrating the field lines of the magnet - there's only one polarity of field lines running below the magnet, so when you try to put the weight flat, the field lines coming out of the edges of the disc are the same polarity as the field lines coming from the bottom of the magnet. The same polarities repel eachother. This is why when you have 2 weights hanging by their edges, the bottom edges of the weights repel away from eachother. Same principal as a gold leaf electrometer - if there's charge there, it repels the same charge on the other leaf. The weight wants to migrate to the edge of the magnet so that the field lines coming out of the edges can wrap around the edge of the large disc magnet to the other side / other polarity
Check out 'demagnetizing field'. Objects elongated in some direction tends to magnetize in this direction. Specifically, sum of demagnetizing coefficients N in X, Y and Z is 1, and N is approximately 0 in a very long direction (i.e. proportionally evidently the longest). Demagnetizing field, opposite to magnetization, equals NxM (for N=1 magnetization and demagnetization are equal). So for needle 'standing in Z' we have from symmetry N=0 for Z and 0.5 in X and Y - no problem with Z, max 0.5 out of what could be expected in X or Y. For plate 'lying in XY' we have N=1 for Z and 0 for X and Y, so no problem with magnetizing along plane, and almost no net magnetization along Z. Plates do not magnetize perpendicular to the surface. Screwdrivers magnetize only along main axis. This is also called shape anisotropy.
I would love to see magnetic viewing film slowly exploring the magnetic fields, both of the magnet itself and of the iron weights eccentricities, looking for your Patreon
Try this with other elongated objects, like bolts, nails and screws. Maybe even try small metal bars. I wonder if the shape has something to do with it too, as most of the shapes you used had holes in them.
Its a good thing the washer didnt stick, you may never have gotten if off. I put a 1943 us penny (zinc coated steel) on a much smaller magnet and it was extremely difficult to remove
My guess was, to put it simply, that opposite pole has to go somewhere when it came out the other end it's like what you explained with the repulsion keeping it from snapping onto it flat. Something like that. In any case it's always fun to watch a grown man still playing with magnets on a table haha
Maybe you could make video where you heat the weight and let it cool while still in the magnetic field? How strong a magnet can you make with your super magnet ?
In air and with the ferrofluid the particles that are affected by the force are disconnected from each other and can move independently. In the barbell weight disparate particles are mechanically linked and so the relative strength of the magnetic field / Force are compelled to fight against each other by the linkage.
Small thing but I would have liked to see the magnetic line simulation when the weight is flat against the magnet but not centered. We saw a simulation of the weight hanging and flat against when centered but you also demonstrated that the magnet can be flat relative to the magnet if it is off center and I'm curious as to how the simulated field lines would look.
The only other reason I can think of for this hard to explain magnetic behavior is that when you place a piece of ferromagnetic metal into a magnet's field, you are simultaneously creating a North and a South pole on the piece of metal that is placed within the field. Generally speaking, you can only create pairs of magnetic poles or magnetic dipoles, though some scientific papers have claimed to have created things they called mono-pole magnets. The positions of the poles created on the ferromagnetic metal when moved within a magnetic field are determined by the part of the ferromagnet with the strongest magnetic flux lines passing through it taking on the opposite pole to that of the field it is in. This creates a corresponding dipole in the ferromagnet that is forced to the opposite side of the ferromagnetic metal in the region of weakest magnetic flux. Because this is a smaller pole matching the field of the original magnet (a smaller North in the field of the magnet's original North side or South in a South) it is repelled from the influence of the original magnets poles. The ferromagnet in a strong North pole creates a South pole in the ferromagnet along with a corresponding North pole that is within the influence of the original magnetic North pole. This explains why the magnet behaves in the ways you noticed and perhaps a better scientist can explain this more clearly. Let me know if I can say this better and feel free to add to it or correct it if you can! Thank you!
Ferromagnetic materials aren't "attracted" to magnets. They try to minimize the energy of the magnetic field passing through them. This functionally means that they follow (and try to contain) magnetic field lines. To be more precise, there are local minima in the configuration of whatever ferromagnetic materials you put near a magnet that require some amount of energy to reconfigure into a different (lower or higher) local minimum. You could do the same experiment with the weights on top of the magnet instead of under it but it would be much less stable with gravity working with the energy needed to reconfigure the weights instead of against it as it does with the weights hanging. How big a relative energy barrier there is depends a lot on the sheer mass of the chunk of iron you're putting on the magnet. The bigger the chunk of iron, the more magnetic field the iron can contain and the more (and deeper) the local minima of configuration energy. More simply: the larger the piece of iron, the more it can affect the shape of the surrounding magnetic field. I have a bunch of these very large neodymium magnets too and its easy to balance a pin or a razor blade or a screwdriver or knife point (or edge) towards the magnet with the object pointing up instead of hanging down.
nono..it appears right...it was more or less exactly what i thought would apply. many thanks for your work. the channel is truely, a great source of knowledge :3 stay safe :3
Individual magnetic field lines extend between north and south in concentric torus shape. Your iron is attracted srrongly to the flux in one magnetic field line at a time - linking/unllinking field lines has a canceling effect.
Looks like a good workout. I just hope the table extender doesn't give up. Maybe try some legs (attached without any ferromagnetic parts) under it, just to stay on the safe side. After all, that are a lot of forces involved. Also, couldn't you make the weights fall by dragging the blanket (and the magnet with it) towards the center of the table?
Consider a rod with two ferromagnetic spheres on each end and a pivot point between them. -Introduce a magnetic field in the form of a dipole magnet. -Influenced by this external field the spheres will find the internal field that minimises the torque about the pivot. If not for gravity the rod would be tangent to the external field. -The other state, is when the magnetic restoring torque, is cancelled by the normal force of the table. -The inflection point, is where the distance between the spheres and the pivot, is insufficient to describe the radius of curvature of the field(+some gravity stuff), and "falls" toward parallel to the magnet, but is stopped by the table. -Now in theory a homogenous disc, in a perfectly symmetric uniform field, could be balanced flat centre. But just as balancing a pencil on the tip, any perturbation would send the disk to one of the other states. -Reluctance is not really necessary for the description, as the same would happen if the reluctance for the ferromagnets matched the medium(ex. air).
In these uncertain times, we need magnets more than ever. Large, powerful magnets, strong enough to guide us all.
Strong enough to align us all*
Fuckin magnets, how do they think?
Let your heart be your compass and knowledge be your candle. We won't get lost, love always wins. It might take lifetimes but it will win. One love, one family, one planet and only one you!
@E Van basically derranged pedophiles larping as commies
You only want a powerful magnet if it works with you. Remember it can also work against you.
I really love when reality trumps common sense. At the beginning, I considered the dangers being raised to be very, very plausible. As you began to test them out, I was cringing inside, waiting for a strong reaction leading to disaster. What a cool video. Thanks so much!
I'm right there with you, I absolutely would be afraid to replicate this in person, even after seeing this video, eventhough I know better now.
B75; You are going to get in the center of the magnet.
Magnet; na, I don’t feel like it.
B75; I’m telling you, get there, now.
Magnet; I told you that I don’t want to.
B75; I don’t care what you want, right now. Go!
Magnet; make me.
B75; goooo
Magnet; clump
B75; come on back, let’s try it again.
Magnet; no, you can’t make me.
B75; come on, I’m tired of this. Let’s go.
Magnet; nnnoooo
B75; oooooooooooooooooo, that’s it don’t make me come back here with my stick. I will do it.
Magnet; mmmhh
B75; you have till the count of three. One, two,
Magnet; you will not make me move.
B75; come on, I got you. Come on.
B75’s back; this is tough. I don’t think it wants to come. Let’s give it a minute.
B75; no, I aallllmmmooosst have it. Come on legs. Put some work in.
Magnet; nnnnnooooon nnnooooonnnnooo
B75; ooooffff, I got it.
5:30 there are safe shoes without steel. For various reasons, steel is now being replaced with other material.
The root issue is that steel is a shape memory material, and we now prefer that, once the deformation point is reached, material do not bend and punch the foot with permanent memorized pinched, but we prefer the materials to just break. Broken shoes are easier to extract. Pinched shoes are very difficult to remove at hospital, and once you know the energy involved passed any reasonable value, doctors prefer removing parts of shoes rather than having to grind steel literally glued to skin.
I don't know if materials are derived from plastic, glass, or carbone.
that and steel is expensive, random other materials are cheaper to produce so therefore bigger profits for the companies. Steel toes are superior in maximum performance but honestly if you're dropping nukes on your toes, you're doing something wrong.
Carbon Fiber, Fiberglass, and various polymers are pretty common. i think the CF and FG would be the best options since you can actually wrap them into the sole a bit to create a sort of toe box that's much more durable than just a toe lid or toe hat.
Actual steel toed boots are indeed getting more rare. Since they are frankly worse. (some insurance companies don't even regard steel toed boots as safe, and won't cover medical costs if such were used.)
Composite shoes with fiber glass, carbon fibers, or at times Kevlar are all more light weight, non magnetic, and cracks when overburdened instead of deforming. It is far easier for crushed toes to heal if not encased in a few mm of steel. And a lot of composite shoes are even stronger than steel ones, especially as far as weight is concerned. Composite shoes are though typically more expensive than steel ones, since making composites is more labor intensive then forming a piece of steel. (and steel is also cheaper than composites from a raw materials standpoint)
There is also plastic reinforced shoes, these are also much cheaper than steel, however less strong. But for a lot of lighter applications these are strong enough, while having the advantage of not encasing toes in hard to remove material.
@@dimitar4y "steel toes are superior in maximum performance" based on what? Your personal preference?
@@GameTimeWhy ... based on basic materials science? you fucking spergerstein? If carbon or plastic was better than steel, they would use those to make buildings, not steel beams. The two problems of steel toes is weight and irremovability once it *does* get crushed. But it's yield strength is the highest of all other offered materials.
3:40 you can see a gap between the plates when they're swinging, incredible
i think it's an optical illusion.
@@CM-xr9oq how?
@@awesomeavis7861 Because both are round, there's literally a point contact and it's hard to see in motion. But they're definitely connected at all times.
@@Hasan... if there was a point of contact you’d see it like you normally can when it’s not moving
I think we would either need the raw uncompressed footage or a slow motion camera to confirm this, the problem is that if the plates would seperate, the Magnetic force would decrease by the square of the distance, and the centrifugal force would increase as they sepperated, and because they are not connected and no change of medium there should only be a decrease in magnetism as the magnets begin to seperate.
After reviewing it in this fasion, I too believe its an illusion created by video compression and or the camera itself. I do not think they ever sepperated, and if they did, it would be Very brief and as a result of vibration, not centrifugal forces, soemthing that only a slow motion camera could catch it.
You just explained it by yourself:
Ferromagnetic objects try to align alongside magnetic field lines, which are vertical at the magnet center and horizontal at the edges.
Yep, exactly what i came for in the comment section :)
We should call this the brainiac theory! Ba dum tis
Yeah, you came up with the same explanation I did, essentially. You put a ferromagnetic material up against a magnet, it becomes a magnet itself. Which means for long objects, the far end is the same pole as the face of the magnet and they'll repel each other. This is why paperclips stand up.
For the lying flat scenario, you'd have to absolutely perfectly center the weight under the magnet and have it be perfectly parallel to the magnet as you bring them together. Any variance at all would cause it to polarize the closer side as opposite to the face of the magnet and the far side the same, force it it upright.
yes, the whole explanation rests on the poles attracting and repelling each other.
That's what I was thinking, too; but in a much simpler way. Yours is better thought out.
this would look really strange if people didn't know there was a magnet up on the table.
Or what magnets are
A hidden magnet channel, where unwitting strangers suddenly do battle with an invisible force. :-D
I think it looks strange enough even when you know there's a magnet.
And also I think it would be impossible to see without realising that there must be a magnet.
Brilliant! 😀 the clip of you doing the reverse weightlifting gave me great laugh. Stay safe and remember to degauss your weights before your next session 👍😀
"Remember to like, *and maybe even subscribe* "
That's some good ol' fashioned humbleness right there. I respect youtubers who don't throw the request in your face, or try to guilt trip you, ect.
Your content is very reliably good, so a sub is a no-brainer. Keep up the good work!
Yeah your explanation sounds correct, it's exactly what I was thinking when I saw the weight flip up and the two bottoms instantly repelled one another.
10:36 now I'm curious: What does the FEM simulation look like when the weight is flat on the magnet and at an offset like shown at 7:43?
I like your magic words funny man
Damn. That's a nice question. Got me thinking... This is my take on it 🤔
I'd think it would still be the same. Though the fieldlines at the side are more going sideways and to that are more dense.
So adding a flat metal on the left side, many field lines pass through the left side of the metal in an almost parallel manner to the metal. Only few field lines are in the opposing direction on the right side of the metal.
So I'd say, the left sides attraction overpowers the repulsion of the right side.
Maybe the weight ‘conducts’/refracts/redirects’ the field lines convergence points. If each line has areas of N and S along it…then perhaps it could be that as these parallel lines approach so too does the attraction between them.
The way i interpret the software makes me "see" why that works but would still be weaker, but actually seeing it in the software would be aweaome
The software FEMM is freeware.
I get in enough trouble with small Neodymium magnets.
You can also see this in the videos of MRI magnets that are being decommissioned. The various metal objects released near the magnet stick out instead of being pulled flat against the magnet. Search _magnet quench_ for hours of entertainment.
they should put a superconductor in the room with those magnets, please get somebody to try that. xD
I love the one where you can see a liquid running off the helium exaust tube, and it's actually ambient air condensing and raining into the room!
@Seldoon Nemar dangerous, too. Mostly LN²
@@hughbrackett343 I was less worried about he LN2 and more worried about the straight O2 mixed in there as if you were doing a quench in a true emergency, I think liquid air is a flamibiblity hazard. I'd hate to hear about a piece of electronics getting sucked onto a patient so they quench and a fire breaks out in the room... that's nightmare fuel
@Seldoon Nemar true, I forgot the LOx is a huge fire hazard.
I would be interested in seeing you test the snap force, using a hand/finger made out of ballistic gel & bone. A good visual of the possible danger to hands/fingers.
Hot dogs! Haha
Your videos are some kinf of hypnotic, really! I can't wait the next one, every time.
Your explanation makes perfect sense to me and aligns with what I have seen here in my own much smaller scale experiments.
I am taking a Physics class right now and the one thing that my physics professor would say is that there are no monopoles. When you magnetize an object (or creating a temporary magnet by introducing the iron to a magnetic field), you are creating an object with both a South and North Pole. The paper clip and the weight do not want to lie center of the magnet because their temporary poles are repelling them against the magnetic poles. This causes them to align themselves with the magnetic field in the direction with the largest decrease in magnetic strength, in this case vertically.
At the edge of the magnet, there is a large decrease in magnetic strength between the center and outside where that magnetic field curves from parallel to the edge to the center of the magnet. The induced magnet in the iron makes it really easy to align the metal to the edge of the field.
I recognized this phenomena over a decade ago, using things like paper clips, nails, and other objects. Your graphic explanation is exactly how I rectified it in my mind back then, so I believe you're 100% correct in your analysis. Now, where things would go terribly wrong, and you would lose digits or eyes, is if you tried putting another similar magnet under the table! Then things would happen exactly as others feared, and it would snap flat and center, or if two, they would snap together in either direction dependent upon certain variables. Needless to say, it would be foolish to even try! Absolutely love your videos...
Edit: btw, I'm guessing you can take those washers or paper clips, and easily lay them flat along the edge of the magnet face...
the force of the snap would definitely break the table, too. and probably the moving magnet.
Omg I never knew how much I needed this ESA merchandise in my life
Lovely, These videos are always so entertaining and I can watch hours of this stuff , in fact I liked it so much I have some strong magnets of my own! (weak to yours lol) and your explanation seems correct one of my favorite videos.
Glad you like my videos! All neodymium magnets are strong. No need to go as big as in this video ;) Much more videos to come.
It's hilarious seeing you fight that magnet. Great video.
I really like your work. I've always been a big fan of magnets and magnetism.
This is a brilliant demonstration of induced magnetic fields.
This is because of the Demagnetization Field. This term and its explanation can be found in litterature and in most books on magnets, like Blundell's book on Magnetism. In this example, when a magnet is flat in one dimension, the H field between the two imagined "Magnetic charges" on the top and bottom layers cancels out the Magnetization field, M - because they go in opposite directions. For long objects, the "magnetic charges" are far away from each other, thus the H field inside the magnet is small, and a large Magnetization can occur inside, which was what your simulations showed.
When simulating and calculating this effect, you will need to specify the Demagnetization Tensor, which gives tells how much the magnet Demagnetizes itself in different directions - the shorter the magnet, the larger the Demagnetizing effect.
Gonna say getting under a table extension, bracing your foot on it, and pulling against a heavy magnet on top is a fair bit more dangerous.
The explanation is very counterintuitive to what most people understand about how magnets work. A number one rule in physics is that magnetic fields can't do work. On its face, this seems to fly against everything we know from practical experience. However, what generates the forces that we normally experience when we play with magnets is actually the magnetic field gradient. In this case, your supposition is correct. When the dumbbells are oriented edge on the gradient is very strong, which induces a very strong corresponding magnetic field in the iron. This feedback pulls additional field lines in until it reaches equilibrium. When it's parallel to the surface though the magnetic field gradient is very weak, and therefore induces a very weak field in the iron.
New upload from Brainiac75 on this Beautiful Sunday morning!
Thanks, Maximus :) Beautiful, but cold evening here in Denmark ;)
hi good to see you back
Never really been gone ;) Check my channel for the monthly uploads.
Great video as always!
The easiest way to analyze it is probably in the context of equivalent magnetic circuits. I don't have too much experience with them, but I believe what's happening is that the weight is moving into the position which minimizes the magnetic reluctance. There's a lot of good info online about magnetic circuits.
Electromagnetism never loses it's magical appeal to me.
It is so 'other-worldly'
One of the great wonders of nature.
Well done Michael Faraday!
Great video as always.
Like others in the comments, I would enjoy seeing that magnetic field program depicting a flat weight offset from the center of the big magnet, for comparison, if that is possible.
another video so soon! such a pleasant surprise!
February is short, but I managed to make a long video ;) Much more to come. And thanks for the early watch, sulfie!
I love when an new video comes out!
I like your other videos where you respectfully warn viewers of the various potential hazards associated with the content, but never assume that they are not capable of coping with them on their own. I click away from other videos when they assume somehow none of us are as capable.
Thanks! Gave me an idea for a magnetic catapult!
whats interesting to note is the weight reduction while under the effects of magnets while swinging. if polished surface might swing for every. great content sir
03:40 when the weights started swinging, there are moments where they aren't even touching, but still follow the magnetic force! :D
I experienced this phenomena about 30 years ago. I played around with my keys outside a NMR cryogenic magnet and discovered that the keys were pulled towards the magnet along the magnetic field lines, but following the lines around the keys now pointed away from the magnet while pushing against my finger... I kept a very tight grip of the ring holding my keys. :-)
To explain any physical system, just look at the energy in the system. For this case, when the object aligns along the magnetic lines the energy is locally minimized. If you want to turn the weight there is a energy penalty to overcome. If the system is in a stable state you have to add energy (force x distance, poking with a stick) until you reach a maxima and the system can drop down into the next minima of the system.
In my example of the keys and in your video it means that the object is in a local minima and can't turn as it requires more energy than the system possess. Adding energy in the form of violently shaking things could bring a system from a local minima into a deeper global minima. The other way around is harder.
I've been too long-winded, so I just say, Nice video! :-)
The way I look at it is that the permanent magnet induces a dipole EM field into the iron weights, and the most stable self-organizing configuration is where the poles of that induced field have the maximum possible separation. Pushing the weight flat forces a metastable state around a local potential mimima and the quick flops represent the local maxima where the configuration slips from one energy well to another.
Great work👌
Best quote I have heard in a while. "I'm not a fan of the implied forced appreciation".
When i think about it, all i could think of is how the magnetic field spins around its edge and go through the center densely and straight down, therefore grabbing the also-vertical magnetized object in a better position. It seems i was kinda right, but thanks alot for the color/visualization of it! 👍
Your theory makes a lot of sense to me.
I have a theoretical experiment that could be performed in order to test the theory.
Place the magnet so that it is at a 90° angle from your usual positioning on top of the table. Slowly bring the barbell weight towards the bottom of the table first in the usual perpendicular to the ground and then parallel to the ground. And we'll see which orientation has the stronger magnetic attraction.
It's so counter-intuitive because just looking at it, we assume it to behave like gravity, which (I believe) behaves in straight lines. But magnetic fields aren't straight lines, and the poles don't act like mass.
I am amazed at how little we understand these things. We can describe them so accurately, but no one can explain a "mechanism" of cause. That kills me, and most don't even see the difference between "what" it does and "why" it does it. And then, magnetic lines do not exist, but most people think they do. The lines come from our attempt to describe and visualize, but the field itself is smooth and homogeneous. The spikes in the fluid come from how mass channels the field around other mass, not from the field itself.
It's a function of the Surface area that interrupts the magnetic field, and total distance the field has to travel through the material, and the material's magnetic permeability. Think of how magnetic chucks for CNC machines work.
I don't think behaviour of magnetic chunks of cnc machine is common knowledge...
@@NoNameAtAll2 that's why i mentioned it so people can look into it and learn more about it, as it gives a lot of intuitive knowledge about magnetism.
@@NoNameAtAll2 well it should be lol
#ripmanufacturing
@@dimitar4y shout out to to HAAS youtube channel! Great vids on chucks and EVERYthing else.
It has to do with the shape of the magnetic field. It's stronger near the edges and in the center.
Depending on polarity, the field will flow up from near the edge on the face of the magnet, and flow towards the middle, or the other way around. This means that it wants to "short" the magnetic field through the metal you use. This poses a few different issues:
1: the material is saturated by magnetism, and is partially attracted to the magnet, but also repelled, much like the experiment of having 2 metal strips hanging, charged at the same high potential will repel.
2: for the weights with a hole in the middle, you'll likely still have the same issue as above, but it's likely made worse by the fact that you have a hole in the middle, where the opposite polarity to the edge is.
If you had a thick cylinder without a hole, that has enough mass and capacity to not be saturated by the magnet, it would likely happily stay in the middle. If it does not have the magnetic capacity, a chunk of metal that big, might just flip the magnet in stead.
12:40 I can smell that "fresh book" smell, right through the screen.
I've always been curious of this behavior... it makes sense after a reminder of the poles and fields.
I wrote a 10 page assignement on magnets a while ago. Your explanation as far as i know is correct. Though the resistance to flipping aweight is not only due to the repulsion but also because you move the weight through and out of the fieldlines. Though i'm not a 100% on that part.
I was about to write something "because in a flat position the field would become an unstable mess", but you've demonstrated it in a sim. The magnetic lines that would form in a pancake will not form a good magnetic dipole, instead having poles scattered as rings god-knows-how. There is a big difference between being a magnet, which is best flat, and being magnetized.
The reason there is no scientific papers on that problem is probably because it's quite straightforward.
It's enough to consider 2 things:
1) Magnetic field can represent potential field by sort-of-inversing curl.
2) Everything in mechanics wants to achieve the maximum drop in potential energy possible, given the initial conditions (see Euler-Lagrange equation). Or everything follows the path of the most drop in potential.
From those two, an axis aligned flat object on a magnet would experience the least possible potential (field) drop. There are neighboring positions with higher drop and the object will try to jump to them. This is as plain as putting two spheres one on top of another: the position is unstable and the top one will roll down.
Lying flat off-axis over the edge of the magnet is also stable, although less stable. That creates a crisscross pattern for the poles in the magnetized object where the hanging part of the object is attracted to the side of the magnet, because it is polarized in reverse and wants to attach itself to the side.
Always scary when he pulls his magnets out! I’m surprised they haven’t eaten your fingers. Please be safe love your video they are very informative
Fun fact- this is why stacking thin sheets is used for motor rotors. the magnetic lines build up in the plates individually to make strong layers.
Magnetic shape anisotropy will always prefer to magnetize the material in the longest direction possible. There will be less domains compared to other directors and will always be the case unless you're dealing with single crystal materials
I'm curious if different shaped magnets would change things, like more of cylinder shaped magnet or a cube shaped one
In any arbitrary configuration of magnets and ferromagnetic objects, the force always is in the direction that increases the total magnetic flux. The flat disk of iron on a pole increases the total flux just a bit, but any tilt increases it even more. So the flat approach is not stable. If the disk were perfectly constrained to move only along the axis of the magnet, it would be weakly attracted. But the slightest tilt would produce force that increases the tilt.
Within the magnetic field of the neodymium magnet, the weight becomes its own magnet. I my opinion, it's a question of geometry. The same poles on a magnet want to be hella far from each other, so any object placed towards them should line up in a stable and long orientation.
Thanks for showing all this neat stuff. Could you please do a video where you show the magnetic axial flux lines with ferrofluid, and then rotate the magnet around that axis? This would visualize the Faraday paradox, that still today isn't fully accepted or understood. A rotating stand with a monster magnet on top - a glas bowl of ferrofluid would do the trick? 😇
I don't know much about permanent magnets other than the iron filings experiment I did in school (well also things like the curie point and stuff) though I was about to sketch out the exact same thing in your simulation.
It's easier to picture in my head but because the field lines extend out almost perpendicular to the magnet they'll 'interface' better with perpendicular objects.
Edit: You explained it better.
i've always known objects will be forced into alignment with the magnetic field's directions, but i've never really thought of it this way. its the same reason that when you sprinkle iron dust on a magnet, it doesn't all clump tightly to the magnet and instead forms peaks along the field's vectors. there is probably a formula correlating magnetic flux vs moment of inertia in regards to the shape of things and their mass being affected different ways.
During the video, my speculation was also that it had to be related to the direction of magnetic field lines, where the illustration with a paper clip is more illustrative with the much larger size difference, that it is actively pushed up. Appears that the magnet does not like the lines "trapped" in the metal object being bent too much.
Your explanation sounds good to me
I have those same barbells and weights love how simple
i just BURST out in lauthter at 5:12 - no joke you're a creative t(h)inker :D and i havent even finished the video yet! this is why i love your channel!
iron is not only attracted to a magnet, but it also becomes a magnet itself. It couples to a nearby magnet and reshapes the field giving rise to another pseudo N & S pole.
I've been loosely trying to make formula for this.
It will be helpful to mark ends (sides) on your barbells, as if they are positive and negative, to helo us recognize when they do spin before flipping
What was interesting was how instantaneous the weights jumped into position to align themselves with the magnetic field, as if their mass was completely negligible. Did they even conform to the standard rules of inertia and F = ma? From the video you could estimate the force on the weight to make it jerk move that fast (and jerk to a stop).
Great video, I agree with your assessment here. I would also note that the demagnetization field lines that goes through the cast iron pass through itself to a higher degree when the poles are at the surface of the rings rather that the ends. To what degree, and whether that actually matters on this scale is debatable. FEMM only does 2D as far as I understand. Have you considered modeling in 3D to take the geometry of the magnets into account?
this was very fun :)
Magnetic reluctance (path of least resistance must consider material saturation), no monopoles exist and the fundamental understanding that opposites attract, it's actually pretty simple... path of least resistance with consideration of material saturation and the resultant forces of the object becoming magnetized are what is causing the "weird" behavior, it's two factors being balanced so to speak. When a material magnetically saturates flux basically hits a brick wall as reluctance skyrockets and flux starts finding a less resistive path that will interact with the saturated material. The tipping points (where the action happens) is when one of the factors is more heavily favored, causing a polar swap and things rapidly change to a less resistive state as part of the magnetic flux path. With this understanding we can make a testable hypothesis that an object length will determine the "standing up" effect due to the distance from the magnetically saturated material (now a N-S magnet ) polar opposite interacting the remainder of magnetic flux from the magnet that's not flowing through the saturated object. In short, the wider magnet will stand up a taller object.
One aspect of the geometry you didn't explore further was that all of the pieces you experimented with were toroidal (have a hole in the middle). That air gap may also play a role in the magnetic fields preferred pathway. It may be easier to center a solid disc vs a donut. I still believe the preferred orientation would be to hang but it may not snap off center as consistently like the barbell weight.
Amazing!
Wow, I wasn't expecting you to be able to move them that far. Those magnets really are scary stong though.
7:01 I've never laughed so hard in my life, and I have no idea how to explain why.
Great Video Earthling , How About Using A Ball Bearing In A Plastic Tube That Switches Back And Forth As A Switch ?
Bless Up
It's because the cast iron discs are concentrating the field lines of the magnet - there's only one polarity of field lines running below the magnet, so when you try to put the weight flat, the field lines coming out of the edges of the disc are the same polarity as the field lines coming from the bottom of the magnet. The same polarities repel eachother. This is why when you have 2 weights hanging by their edges, the bottom edges of the weights repel away from eachother. Same principal as a gold leaf electrometer - if there's charge there, it repels the same charge on the other leaf. The weight wants to migrate to the edge of the magnet so that the field lines coming out of the edges can wrap around the edge of the large disc magnet to the other side / other polarity
Check out 'demagnetizing field'. Objects elongated in some direction tends to magnetize in this direction. Specifically, sum of demagnetizing coefficients N in X, Y and Z is 1, and N is approximately 0 in a very long direction (i.e. proportionally evidently the longest). Demagnetizing field, opposite to magnetization, equals NxM (for N=1 magnetization and demagnetization are equal). So for needle 'standing in Z' we have from symmetry N=0 for Z and 0.5 in X and Y - no problem with Z, max 0.5 out of what could be expected in X or Y. For plate 'lying in XY' we have N=1 for Z and 0 for X and Y, so no problem with magnetizing along plane, and almost no net magnetization along Z. Plates do not magnetize perpendicular to the surface. Screwdrivers magnetize only along main axis. This is also called shape anisotropy.
Thanks!
Wow that's awesome
That magnet seems seriously strong ... I wish I could get one of those to play with in person.
I would love to see magnetic viewing film slowly exploring the magnetic fields, both of the magnet itself and of the iron weights eccentricities, looking for your Patreon
5:25 That gives me some bad/silly ideas, like putting magnets in the attic so you can walk on the ceiling.
Try this with other elongated objects, like bolts, nails and screws. Maybe even try small metal bars. I wonder if the shape has something to do with it too, as most of the shapes you used had holes in them.
Its a good thing the washer didnt stick, you may never have gotten if off. I put a 1943 us penny (zinc coated steel) on a much smaller magnet and it was extremely difficult to remove
My guess was, to put it simply, that opposite pole has to go somewhere when it came out the other end it's like what you explained with the repulsion keeping it from snapping onto it flat. Something like that.
In any case it's always fun to watch a grown man still playing with magnets on a table haha
Maybe you could make video where you heat the weight and let it cool while still in the magnetic field? How strong a magnet can you make with your super magnet ?
You're smart👍
My intuition is linking this to the effects seen in superconductive levitation, for some reason.
11:59 I don't know if it's the same thing but the spike form in ferrofluid is due to an effect called Rosensweig or normal-field instability.
In air and with the ferrofluid the particles that are affected by the force are disconnected from each other and can move independently. In the barbell weight disparate particles are mechanically linked and so the relative strength of the magnetic field / Force are compelled to fight against each other by the linkage.
Small thing but I would have liked to see the magnetic line simulation when the weight is flat against the magnet but not centered. We saw a simulation of the weight hanging and flat against when centered but you also demonstrated that the magnet can be flat relative to the magnet if it is off center and I'm curious as to how the simulated field lines would look.
The only other reason I can think of for this hard to explain magnetic behavior is that when you place a piece of ferromagnetic metal into a magnet's field, you are simultaneously creating a North and a South pole on the piece of metal that is placed within the field. Generally speaking, you can only create pairs of magnetic poles or magnetic dipoles, though some scientific papers have claimed to have created things they called mono-pole magnets. The positions of the poles created on the ferromagnetic metal when moved within a magnetic field
are determined by the part of the ferromagnet with the strongest magnetic flux lines passing through it taking on the opposite pole to that of the field it is in. This creates a corresponding dipole in the ferromagnet that is forced to the opposite side of the ferromagnetic metal in the region of weakest magnetic flux. Because this is a smaller pole matching the field of the original magnet (a smaller North in the field of the magnet's original North side or South in a South) it is repelled from the influence of the original magnets poles. The ferromagnet in a strong North pole creates a South pole in the ferromagnet along with a corresponding North pole that is within the influence of the original magnetic North pole. This explains why the magnet behaves in the ways you noticed and perhaps a better scientist can explain this more clearly.
Let me know if I can say this better and feel free to add to it or correct it if you can! Thank you!
Ferromagnetic materials aren't "attracted" to magnets. They try to minimize the energy of the magnetic field passing through them. This functionally means that they follow (and try to contain) magnetic field lines. To be more precise, there are local minima in the configuration of whatever ferromagnetic materials you put near a magnet that require some amount of energy to reconfigure into a different (lower or higher) local minimum.
You could do the same experiment with the weights on top of the magnet instead of under it but it would be much less stable with gravity working with the energy needed to reconfigure the weights instead of against it as it does with the weights hanging.
How big a relative energy barrier there is depends a lot on the sheer mass of the chunk of iron you're putting on the magnet. The bigger the chunk of iron, the more magnetic field the iron can contain and the more (and deeper) the local minima of configuration energy. More simply: the larger the piece of iron, the more it can affect the shape of the surrounding magnetic field.
I have a bunch of these very large neodymium magnets too and its easy to balance a pin or a razor blade or a screwdriver or knife point (or edge) towards the magnet with the object pointing up instead of hanging down.
I'm waiting for the Brainiac75 video in 10 years where he's created magnetic monopoles in his kitchen through testing viewer suggestions.
nono..it appears right...it was more or less exactly what i thought would apply.
many thanks for your work.
the channel is truely, a great source of knowledge :3
stay safe :3
It's the same as the spikes that ferrofluid makes. They repel each other with their own magnetic fields.
I reckon it's what you said !...cheers.
Individual magnetic field lines extend between north and south in concentric torus shape. Your iron is attracted srrongly to the flux in one magnetic field line at a time - linking/unllinking field lines has a canceling effect.
Looks like a good workout. I just hope the table extender doesn't give up. Maybe try some legs (attached without any ferromagnetic parts) under it, just to stay on the safe side. After all, that are a lot of forces involved. Also, couldn't you make the weights fall by dragging the blanket (and the magnet with it) towards the center of the table?
Consider a rod with two ferromagnetic spheres on each end and a pivot point between them.
-Introduce a magnetic field in the form of a dipole magnet.
-Influenced by this external field the spheres will find the internal field that minimises the torque about the pivot. If not for gravity the rod would be tangent to the external field.
-The other state, is when the magnetic restoring torque, is cancelled by the normal force of the table.
-The inflection point, is where the distance between the spheres and the pivot, is insufficient to describe the radius of curvature of the field(+some gravity stuff), and "falls" toward parallel to the magnet, but is stopped by the table.
-Now in theory a homogenous disc, in a perfectly symmetric uniform field, could be balanced flat centre. But just as balancing a pencil on the tip, any perturbation would send the disk to one of the other states.
-Reluctance is not really necessary for the description, as the same would happen if the reluctance for the ferromagnets matched the medium(ex. air).