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Electric and Magnetic Fields
United States
Registrace 6. 09. 2012
At the following link I have arranged 157 videos in an order that will take you from vectors to electromagnetic waves. Many of the videos come from this channel but a few from another private channel I have. On some Browsers you may have to copy and paste the links
engineering.purdue.edu/people/michael.r.melloch.1/Videos/Introduction%20to%20Electric%20and%20Magnetic%20Fields
There are about 50 demonstrations to illustrate concepts. These demonstrations are built from ordinary items, many you might find around your (house, paper clips, batteries, magnets), at a hardware store, or on-line. Details of constructing the demonstrations are included. Examples are demos of electrostatic and electromagnetic induction, construction of a battery, simple motors, generation of magnetic fields from current carrying wires, a simple ac generator, construction of a loud speaker from a paper cup, magnetic braking, demonstration of Young’s double slit experiment, Spark coils, etc.
engineering.purdue.edu/people/michael.r.melloch.1/Videos/Introduction%20to%20Electric%20and%20Magnetic%20Fields
There are about 50 demonstrations to illustrate concepts. These demonstrations are built from ordinary items, many you might find around your (house, paper clips, batteries, magnets), at a hardware store, or on-line. Details of constructing the demonstrations are included. Examples are demos of electrostatic and electromagnetic induction, construction of a battery, simple motors, generation of magnetic fields from current carrying wires, a simple ac generator, construction of a loud speaker from a paper cup, magnetic braking, demonstration of Young’s double slit experiment, Spark coils, etc.
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zhlédnutí: 481
Video
Electric Dipole, Bound Charge, & Polarization
zhlédnutí 4,5KPřed rokem
Electric Dipole, Bound Charge, & Polarization
Synchronous Motors
zhlédnutí 8KPřed 2 lety
A synchronous motor is a type of AC motor invented by Nikola Tesla. On May 1, 1988 Tesla submitted seven patent applications. In error in the video I state that his patent was granted on May 1, 1988, but it was only submitted on this date. I also show the wrong patent because I did not realize he had submitted more than one patent on this date. The patent I should have shown was patent #381,968...
Investigating Electromagnetic Induction (Lenz's and Faraday's Laws)
zhlédnutí 3,3KPřed 2 lety
In this video we look at what happens when a magnet falls though a coil that is attached to light emitting diodes. The change in magnetic flux in the coil induces a current that lights the LEDs. This is known as electromagnetic induction and can be described qualitatively with Lenz's Law and quantitatively with Faraday's Law.
Transformers
zhlédnutí 3,2KPřed 3 lety
Transformers have many applications. They are often used to step up, or step down, voltages. They are used for impedance matching. They are used to go from an unbalanced signal to a balanced signal and in this application are sometimes referred to as baluns (BALanced UNbalanced). Examples shown are power distribution transformers and feeds to dipole antennas. In this video we will build several...
How Much Charge is There on a Van de Graaf Generator?
zhlédnutí 4,9KPřed 3 lety
A Van de Graaff generator is demonstrated, the amount of charge on the generator calculated, how it operates is explained, and a Leiden (Leyden) jar capacitor is attached to it to greatly increase the charge.
Capacitors and Fringing Fields
zhlédnutí 7KPřed 3 lety
The concept of fringing fields from a capacitor is discussed. All capacitors have fringing fields.
Plasma Globe
zhlédnutí 8KPřed 3 lety
A plasma globe is filled with noble gases at a reduced pressure. At the center is a Tesla coil oscillating at 33-35 kHz with an amplitude of 5 kV. This results in plasma filaments inside the globe. The operation of the plasma globe is demonstrated and investigated.
Using a Tesla Coil to Launch and a Loop Antenna to Detect an Electromagnetic Wave
zhlédnutí 3,2KPřed 3 lety
A Tesla coil is constructed using a Slayer switching circuit. It is then used to launch an electromagnetic wave that is detected with a loop antenna connected to an Analog Discovery 2 oscilloscope. The operation of the Slayer circuit Tesla coil is simulated and explained. When I first looked into the Slayer circuit, it wasn't obvious how it worked. I then did what I tell my students not to do. ...
Force on a Current Carrying Wire in a Magnetic Field
zhlédnutí 2,7KPřed 3 lety
When a current carrying wire is in a magnetic field it experiences a force. A wire is placed inside a large magnetic field, 1 T, and then a current is turned on in the wire. The wire moves perpendicular to the direction of the current and the direction of the magnetic field indicating the force on the wire is perpendicular to both the direction of current flow and the direction of the magnetic ...
Capacitor With series Dielectric Example
zhlédnutí 1,1KPřed 3 lety
Capacitor With series Dielectric Example
Capacitor With Parallel Dielectrics Example
zhlédnutí 1,9KPřed 3 lety
Capacitor With Parallel Dielectrics Example
Leiden (Leyden) Jar Capacitor
zhlédnutí 25KPřed 3 lety
The first capacitor was called a Leiden jar, or Leyden jar. It was accidentally discovered that a large amount of charge could be stored on a Leyden jar from the unexpected shock! I will show how I constructed my Leiden jar, charge the Leiden jar using a Van de Graaff generator, and demonstrate rapid discharging (dielectric breakdown) resulting in an intense spark.
Displacement Current & Maxwell's Equations
zhlédnutí 4,2KPřed 4 lety
Displacement Current & Maxwell's Equations
Gradient And Finding The Potential Field
zhlédnutí 568Před 4 lety
Gradient And Finding The Potential Field
Charge, Triboelectric Series, Electrostatic Induction
zhlédnutí 1,5KPřed 4 lety
Charge, Triboelectric Series, Electrostatic Induction
Faraday's Law Example 4 (Electromagnetic Induction)
zhlédnutí 870Před 5 lety
Faraday's Law Example 4 (Electromagnetic Induction)
Faraday's Law Example 3 (Electromagnetic Induction)
zhlédnutí 726Před 5 lety
Faraday's Law Example 3 (Electromagnetic Induction)
Faraday's Law Example 2 (Electromagnetic Induction)
zhlédnutí 814Před 5 lety
Faraday's Law Example 2 (Electromagnetic Induction)
Faraday's Law Example 1 (Electromagnetic Induction)
zhlédnutí 1,7KPřed 5 lety
Faraday's Law Example 1 (Electromagnetic Induction)
How does one estimate the field around a wire. Does it depend on the current flowing through it? The diameter of the wire?
This is how you would calculate the magnetic field intensity, czcams.com/video/Rw7IKosT01E/video.htmlfeature=shared
Which metals can replace zinc and which metals can replace copper?
Take a look at the turboelectric series. The metals close to copper can replace copper and those close to zinc can replace zinc. So aluminum and zinc would work about the same. Metals further apart would probably work even better.
2024
Sir, can you do a video about the math and physics of wimshurst machines?
That is one I actually want to do. I started to build one a couple of years ago but it didn't work. I haven't had a chance to get back to it to figure it out. I will, but it might not be till next summer.
Excellent description of the working process of electron movement and ionisation energy. I really liked the clear and informative presentation. I wish I was one of your students.
Thanks for such a nice, kind comment!
Reminds me of van der waals interactions within cells !
Nvm got it
Great!
How do i make the led backward biased
sir, how many turn is the coil and how much voltage is supplied?
I use a 1.5V battery. I don't remember the number of turns, it was probably 100.
Yay. A.straight to the content.No begging for likes/etc.. B.Great simple audio. C.Clear diction from the presenter throughout D.All the bits laid out so we can see what is being used and assembled in realtime. .....😺even my moggie was watching. well done.
Thank you so much for your kind words!
Beautiful demonstration sir❤
Thank you!
I like your video! Here's a youtube video I want to share with you and everyone! The title is : Continuous Electric Display (CED) In this video, I will do a short demonstration of a new analog display technology, made with static electricity.
Thank you!
How does a battery operated magnetic pump work? There must be an aluminum showing between the coupled magnets, so how do they get around the Eddie current problem and keep their efficiency?
I don't know anything about magnetic pumps. It is something I will look into and maybe there is a potential video there!
@@electricandmagneticfields2314 Oh man that would make a great video! Basically you can magnetically couple a motor to a shaft radially through a housing so there are no shaft seals which is a huge advantag for a lot of reason. However, there are a few tricks to maximize coupling and minimize eddie currents I'm still trying to understand. Advanced Diver Propulsion Vehicles also use them since shaft seals are the biggest risk to flooding a housing: czcams.com/video/eufuhWX-ZjM/video.htmlsi=SGjZJTR_Idv97WEf&t=19 czcams.com/video/IAkxS1xVraw/video.html
@@peteabdu9179 Thanks!
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Is that micro amps?
Yes
How much was this when you bought and where?
It was actually a gift. I found one on Amazon for $12.99, www.amazon.com/Stemclas-Electric-Lightening-Sensitive-Decorations/dp/B08L5Z2Q49/ref=sr_1_8?crid=HIORR4MU917E&dib=eyJ2IjoiMSJ9.9xViOTRFhHjF4gU-SuJEfj6lOTVpP4vYXbbUt7ofSpcWo_Fsjc92DdoeTznJ_R2kTKMX0J2Zezt9Qy3mmGaXkvuXbldI_8qHKbopu993zJlAARCyKRxotAXBU-N_6Z3PXbrh1daIkgBqQ0RedzqZK44VTrwAJ7GOK2yPTwJsnGNPcTv4bBB0ympNqQ5zM81Ne_eNIzaDsYEwP76ssPSkeNElLADZWzzV__7P2GA4LoLcE18l-mncRlfyOiTQbOYXgSFN_NkOkGakCnt492VmxyH5AwClcVshHxZp4orOFPI.s7mEXmhff-KPZYsm4-wnM2zvH_EiaO5tQhs0tt2t7Bw&dib_tag=se&keywords=plasma+globe&qid=1720530084&sprefix=plasma+globe%2Caps%2C155&sr=8-8
How long can this Leyden jar store energy(hold the charge) if you don’t discharge it?
A very long time. It depends on the leakage current through the glass insulator. I am guessing for years. That is why capacitors in electronics like old CRT TVs and microwaves can be dangerous.
I notice that in vulcanic storm there are more thunder than a rainy storm, due to the amount of ash and powder, so i wonder if this experiment could work using sand or ash instead of water. ? ?
I do not know. Maybe if there are positively and negatively charged particles they could be preferentially accumulated in the different cans.
In H_inside we multiply by mu naught?
If you multiply H (magnetic field intensity) by mu naught (permeability of free space) you get B (magnetic flux density)
@@electricandmagneticfields2314 Ah yes, I was looking at substituting H into the equation for B. Thanks
😅
😅
Really nice demo and explanation plus very interesting watching you make the Leydon Jar.
Thanks, glad you enjoyed it!
Elektromanyetik indüksiyonu Michael Faraday'ın gerçekleştirdiği bir deney benzeriyle göstereceğim. Burada bir ampermetre ve üç bobinim var. Bir döngülü, on döngülü ve yüz döngülü bobinlere sahibim. Ayrıca bir çubuk mıknatısım var ve ilk olarak tek döngülü bobini ampermetreye bağlayarak başlayacağım. Şimdi tek döngülü bobin ampermetreye bağlı ve çubuk mıknatısı bobinin içine sokup çıkaracağım, çok yakından izlerseniz ampermetre ibresinde hafif bir sapma görebilirsiniz. Şimdi on döngülü bobini bağlayayım ve aynı şeyi yapacağım. Çubuk mıknatısı bobinin içine sokup çıkarıyorum, şimdi ibrede daha fazla hareket görebilirsiniz. Gerçekten çok yavaş hareket ettiğimde küçük bir sapma görüyorsunuz ve hızlı hareket ettiğimde daha büyük bir sapma görüyorsunuz. Ayrıca mıknatıs içeri girdiğinde ibre sağa sapar ve dışarı çıktığında sola sapar, ancak mıknatıs hareket etmediğinde akım olmadığını gösteren herhangi bir sapma olmaz. Dolayısıyla manyetik alan bobine girdiğinde pozitif akım akar, bobinden çıktığında ise negatif akım akar. Şimdi yüz döngülü bobini bağlayayım. Mıknatısı çok yavaş hareket ettirdiğimde sağa sapma görüyorsunuz, dışarı çıkardığımda ise sola sapma. Hızlı hareket ettiğimde ise çok daha büyük bir sapma görüyorsunuz. Yani manyetik alanın değişim hızı akımı etkiler. Gördük ki bobindeki dönüş sayısı arttıkça akım artar, dolayısıyla akım dönüş sayısına orantılıdır. Ayrıca manyetik akı değişiminin hızı arttıkça akımın da arttığını gördük. Şimdi eğer devrenin toplam direncini izleseydik, yani bobinin, tellerin ve ampermetrenin direncini, akımın devrenin toplam direncine ters orantılı olduğunu bulurduk. Bu denklem genellikle i = -n / R decide ET olarak yazılır ve bu eksi işaretinin Lenz yasası hakkında gelecekteki bir videoda anlamını tartışacağız. Dolayısıyla denklemin her iki tarafını R ile çarptığımızda R I = -n decide ET ve direnç ile akım bir gerilim veya potansiyel oluşturur, buna elektromotor kuvvet denir ve elektromotor kuvvet -n decide ET olarak eşitlenir ve bu Faraday'ın yasası olarak bilinir.
I am going to demonstrate electromagnetic induction with an experiment similar to the one that michael faraday performed. I have an ammeter here and i have three coils. I have a coil with one loop ten loops and 100 loops. I also have a bar magnet and i will start by connecting the singel loop coil to the ammeter. I now have the single loop coil connected to the ammeter and i am going to move the bar magnet into and out of the coil and if you watch very closely you can see a slight deflection of the ammeter needle okay so now let me connect the ten loop coil. Then i am going to do the same thing. I am going to move the bar magnet in and out of the coil now you can see more movement of the needle in fact if i go very slowly you see just a little bit of a deflection and if i go quickly you see a greater amount of deflection also as the magnet is going in the needle deflects to the right and as i pull the magnet out it deflects to the left but when the magnet isn't moving there's no deflection indicating no current flowing. So when the magnetic field is changing going into the coil there's a positive current flowing when it's changing coming out of the coil there's a negative current flowing and now let me connect the hundred loop coil. I will start by moving the magnet in very slowly you see a deflection to the right pull it out to the left if i go in quickly you see a much greater deflection. So the rate of change of the magnetic field affects the current. We saw that as the number of turns in the coil increase the current increase so the current is proportional to the number of turns which we'll use and to represent we also saw that the current increase as the rate of change of magnetic flux inside the coil increase so decide et represents the change in the magnetic flux inside the coil now if we were to monitor the resistance of the whole circuit that is of the coil and the wires in the ammeter we would find that the current was inversely proportional to the total resistance of the circuit now this equation is usually written as i is equal to minus n over R decide ET and we'll talk about the significance of this minus sign in a future video on lenz's law so now if we multiply both sides of the equation by R we get R I equals minus and sie DT and resistance times the current is a voltage or a potential we call that the electro-motive force and so the electro-motive force is equal to minus n decide ET and this is known as Faraday's law.
Elektromanyetik indüksiyonu Michael Faraday'ın gerçekleştirdiği bir deney benzeriyle göstereceğim. Burada bir ampermetre ve üç bobinim var. Bir döngülü, on döngülü ve yüz döngülü bobinlere sahibim. Ayrıca bir çubuk mıknatısım var ve ilk olarak tek döngülü bobini ampermetreye bağlayarak başlayacağım. Şimdi tek döngülü bobin ampermetreye bağlı ve çubuk mıknatısı bobinin içine sokup çıkaracağım, çok yakından izlerseniz ampermetre ibresinde hafif bir sapma görebilirsiniz. Şimdi on döngülü bobini bağlayayım ve aynı şeyi yapacağım. Çubuk mıknatısı bobinin içine sokup çıkarıyorum, şimdi ibrede daha fazla hareket görebilirsiniz. Gerçekten çok yavaş hareket ettiğimde küçük bir sapma görüyorsunuz ve hızlı hareket ettiğimde daha büyük bir sapma görüyorsunuz. Ayrıca mıknatıs içeri girdiğinde ibre sağa sapar ve dışarı çıktığında sola sapar, ancak mıknatıs hareket etmediğinde akım olmadığını gösteren herhangi bir sapma olmaz. Dolayısıyla manyetik alan bobine girdiğinde pozitif akım akar, bobinden çıktığında ise negatif akım akar. Şimdi yüz döngülü bobini bağlayayım. Mıknatısı çok yavaş hareket ettirdiğimde sağa sapma görüyorsunuz, dışarı çıkardığımda ise sola sapma. Hızlı hareket ettiğimde ise çok daha büyük bir sapma görüyorsunuz. Yani manyetik alanın değişim hızı akımı etkiler. Gördük ki bobindeki dönüş sayısı arttıkça akım artar, dolayısıyla akım dönüş sayısına orantılıdır. Ayrıca manyetik akı değişiminin hızı arttıkça akımın da arttığını gördük. Şimdi eğer devrenin toplam direncini izleseydik, yani bobinin, tellerin ve ampermetrenin direncini, akımın devrenin toplam direncine ters orantılı olduğunu bulurduk. Bu denklem genellikle i = -n / R decide ET olarak yazılır ve bu eksi işaretinin Lenz yasası hakkında gelecekteki bir videoda anlamını tartışacağız. Dolayısıyla denklemin her iki tarafını R ile çarptığımızda R I = -n decide ET ve direnç ile akım bir gerilim veya potansiyel oluşturur, buna elektromotor kuvvet denir ve elektromotor kuvvet -n decide ET olarak eşitlenir ve bu Faraday'ın yasası olarak bilinir.
Surisped nobodys here becomes of rooms
Can you give a theoretical proof by considering charges and force components on them at both pointed and blunt ends , I have been looking for one for a long time .
Did you watch starting at the 3:30 point in the video?
Yes but on re-watching it's clear now
Why does this attraction work only on the continuous part of the jet (at the top) but not on the water droplets after the jet breakup? (15 cm lower)
The electrostatic attractive force falls off as one over the distance squared. So the force of gravity overwhelms the electrostatic attraction once the water is far enough away.
But what do the particles do in a fluid.? You had to tap the board, so there is friction between particles and surface. What happens when this friction is removed by placing particles in solution. We then see 3 dimensions, and I suspect, a map of the coil arrangement. hmmmmmm
It would be similar to this done with a bar magnet, czcams.com/video/QaZ0h76X6d0/video.htmlfeature=shared
@@electricandmagneticfields2314 Excellent. Thank you sir!
@@mrbrown6421 You are welcome!
@@mrbrown6421 You are welcome.
1) Although your hand cannot detect a difference, does it take more force to push the magnet through the 100 loop vs 1 loop ? 2) Do we understand, at the quantum level, why this electric force generation occurs ? 3) I noticed your meter bounced, which implies when removing the magnet, the field collapses into an AC current, which is not possible. You might mention why that meter is bouncing. Thanks. -- Some retired software guy. -- 5.22.24
1. Yes it would take more force. Moving the paddles by hand with the apparatus in this video I can feel the force czcams.com/video/MglUIiBy2lQ/video.htmlfeature=shared 2. It is a fundamental observation of nature. No different than trying to find a deeper explanation of why do two like charges repel. 3. That is probably a mechanical reaction of the meter.
@@electricandmagneticfields2314 Thank you. 1 out of 3 is not bad. My investigation continues elsewhere. Later !
You sir must be a teacher. I learned stuff without paying much attention! (I like watching videos while cooking etc)
I am glad you learned stuff from my video! That is why I do them.
@@electricandmagneticfields2314 I wish I knew about your channel when I was in Highschool 😅 (8 yrs ago)
@@thakyou5005 Thanks, better late than never!
اكو عراقيين لو وحدي هين😂
اي
Best demonstration and explanation I have ever seen! 💗💗💗
Thank you!
Wouldn't the flow be over too when all the Cl / Na ions are neutralized?
"Electromagnetic Fields and Waves" by Lorrain & Corson (3rd Edition) covers dielectrics in Chapters 9 & 10 including some enlightening diagrams elaborating on E & D fields and bound & free charge. The problems are interesting as well. I used the 2nd Edition back in the day. Nice presentation!
Thanks, I have not seen Lorrain & Carson but I will take a look.
How did your Casio fare from the Van de Graaff sparks? :)
My watch? It survived, but I probably should have taken it off!
កន្តួយម៉ែហែង❤
ឡូយណាស់❤😂
យល់ស្រប
😢😢
Dot
Ok
woag! awesome!
Thanks!
Great explanation, though I'm wondering where in tarnation I can get those aluminium parts and the magnet ...
www.pasco.com/products/lab-apparatus/electricity-and-magnetism/magnetic-fields/em-8618 www.pasco.com/products/lab-apparatus/electricity-and-magnetism/magnetic-fields/em-8642
@@electricandmagneticfields2314 Thanks so much! Really helped a lot!
Thank you very much!
You are welcome!
im making one, but i have a motor which is very very very slow. its a lego motor. Will it still work?
It will work. The charge will just build up at a slower rate.
How could someone get these tools?
www.pasco.com/products/lab-apparatus/electricity-and-magnetism/magnetic-fields/em-8618 www.pasco.com/products/lab-apparatus/electricity-and-magnetism/magnetic-fields/em-8642
great and practical!!! thank you
Thanks, you are welcome!
Hello professor Melloch, My name is Rich and I was wondering if you could give me an opinion on a possible solution to a problem I’m having with a set of carburetors that would involve eddy current damping. The problem I’m having seems to be caused by the vacuum operated parts of the carbs lifting too early and fluttering. When this occurs, the engine quickly loses power and stalls, probably from an over rich condition. Here is a video of that happening; it should start at an appropriate time index. There is a white dot on the #3 throttle slide ( 3rd from the left), it bounces rapidly as the throttle is opened. czcams.com/video/VtmbGLGt3qw/video.html What I’m wondering is if I could put a small magnet(s) in the plastic throttle slide ears as a way to damp out the fluttering. Not sure what the carbs are made of - Aluminum or Zinc or some alloy in between. This video starts at a point showing the slide suspended in the carb body. czcams.com/video/6sd-YwEv0Jo/video.html I think the fluttering is caused by the air intake pulse on this 4 stroke engine and a lack of slide damping. I would appreciate your opinion as an expert in this field. Thanks
thank you so much
You are welcome!
If it were big enough would a leyden jar be able to power a 2 story house if SHTF and for how long ?
Yes you could store energy in capacitors just as you do in batteries. www.futurebridge.com/industry/perspectives-mobility/supercapacitors-a-viable-alternative-to-lithium-ion-battery-technology/
I dont know why my teacher wasted my whole time Why the schools do not teach the same even after taking a handsome amount of money They are just making students confused
I am glad if my videos are helping to alleviate some of the confusion.
10:40 when the camera unfocuses, is that because of the sudeen light exposition or because of electromagnetic interactions?
@@electricandmagneticfields2314cool
Fantastic explanation, thanks very much👍👍
You are welcome!
So it’s an old school capacitor?
Here is an old school capacitor, czcams.com/video/Lh6YATitN9k/video.htmlfeature=shared