abobjenkins asked Can you explain the meaning of permeability? to which I'd reply with my favorite and clear explanation of it at hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfield.html . The permeability, 'mu', is related to how much stronger a material makes a magnetic field which is passing through it. For a paramagnetic substance (makes external fields STRONGER inside the the substance) the permeability 'mu' is GREATER than mu_0 (the permeability of free space). For diamagnetic substances (make external fields weaker inside the substance) the permeability is less than mu_0. For no substance, i.e. a vacuum, the permeability is just mu_0, or 4pi x 10^-7 N/A^2. Since B=mu*H, (you can think of B as the total field inside the substance, including the magnetic field caused by the magnetized material itself and H as the external field) if there is no magnetized material (i.e. a vacuum or free space) then mu_0 is really just acting as a conversion factor between B and H field conceptualizations. that's just my two cents, I'm no expert, but I'd like to do a video about this too!
Not in this example, but its an interesting question. It may be easier or harder to establish some target surface charge density on a particular conductor, because you need higher voltages for objects with larger radius of curvature to get to the same sigma. You can charge both conductors and insulators, though the methods differ. There probably is some maximum theoretical limit on sigma based on the work function of the metal (the amount of energy required to pull an electron off the metal surface). There's also a practical limit as to how much surface charge density you can establish since if you get an electric field higher than 3x10^6 V/m, air will ionize and the charged conductor will lose charge to air molecules. Thus for a conductor in an air filled lab, the effective maximum surface charge density a charged conductor like a vandegraaf generator can have = epsilon_0 * 3e6 = 2.7 x 10^-5 C/m^2
Hi there and thanks for the comment. Most university physics courses use a concept called "conventional current" in which we pretend positive charges move, even though we all know it is electrons that move in most metals. See en.wikipedia.org/wiki/Electric_current#Conventions for more information. We use conventional current in physics because of historical reasons-primarily Ben Franklin thought that charge carriers were positive.
I am EXTREMELY lost in the first few seconds of this, I literally don’t even know any of the other expressions you talked about. Could somebody give me the simplest explanation of how to find out how big epsilon numbers are?
Hi there, unfortunately epsilon numbers in math have a completely different meaning than the term epsilon_naught in physics, this explains the physics version, not the math one. Sorry.
Nobody on the whole CZcams explained this.
Subscribed!
better than Wikipedia's explanation and probably the best
Quite the compliment. Thank you, and I hope it helped you in your understanding.
Explained perfectly
I'm glad you thought so. Thanks!
abobjenkins asked Can you explain the meaning of permeability? to which I'd reply with my favorite and clear explanation of it at hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfield.html . The permeability, 'mu', is related to how much stronger a material makes a magnetic field which is passing through it. For a paramagnetic substance (makes external fields STRONGER inside the the substance) the permeability 'mu' is GREATER than mu_0 (the permeability of free space). For diamagnetic substances (make external fields weaker inside the substance) the permeability is less than mu_0. For no substance, i.e. a vacuum, the permeability is just mu_0, or 4pi x 10^-7 N/A^2. Since B=mu*H, (you can think of B as the total field inside the substance, including the magnetic field caused by the magnetized material itself and H as the external field) if there is no magnetized material (i.e. a vacuum or free space) then mu_0 is really just acting as a conversion factor between B and H field conceptualizations. that's just my two cents, I'm no expert, but I'd like to do a video about this too!
great sir I will share this to my friends too....really amazing visualisation
Yes, explained in perfect way to easily understandable..sir .Hope to continue pl.
Thank you
Great explanation, thank you very much, so helpful!
Thankyou 😍🦋
thoroughly curated 🔱
MAN I LOVE YOU THANKS
Seriously an epic one sir!
Dude Imperfect I am glad it was useful for you!
Best explanation ever
You freaking saved me, i have a work about this freaking constant
U deserve a million subscribers
4:10 there you go! the whole explanation was just amazing! appereciate your work sir!
happy to assist you in your physics studies. =)
Wouldn't sigma change depending on the slab of material used?
Beautifully explained thanks =)
The electric field is the result of what in that vaccum? I missed that.
thank you!
5:13 wow! I am going to get that antique thing (the calculator) for my home museum, where can I buy one?
easy explanation perfect !
Excellent
Just wondering, is sigma not dependent on the material that makes up the slab?
Not in this example, but its an interesting question. It may be easier or harder to establish some target surface charge density on a particular conductor, because you need higher voltages for objects with larger radius of curvature to get to the same sigma. You can charge both conductors and insulators, though the methods differ. There probably is some maximum theoretical limit on sigma based on the work function of the metal (the amount of energy required to pull an electron off the metal surface). There's also a practical limit as to how much surface charge density you can establish since if you get an electric field higher than 3x10^6 V/m, air will ionize and the charged conductor will lose charge to air molecules. Thus for a conductor in an air filled lab, the effective maximum surface charge density a charged conductor like a vandegraaf generator can have = epsilon_0 * 3e6 = 2.7 x 10^-5 C/m^2
Positive charges do not move
Hi there and thanks for the comment. Most university physics courses use a concept called "conventional current" in which we pretend positive charges move, even though we all know it is electrons that move in most metals. See en.wikipedia.org/wiki/Electric_current#Conventions for more information. We use conventional current in physics because of historical reasons-primarily Ben Franklin thought that charge carriers were positive.
Sir explain the making of •£ unit
I am EXTREMELY lost in the first few seconds of this, I literally don’t even know any of the other expressions you talked about. Could somebody give me the simplest explanation of how to find out how big epsilon numbers are?
Hi there, unfortunately epsilon numbers in math have a completely different meaning than the term epsilon_naught in physics, this explains the physics version, not the math one. Sorry.
what happens if instead of vacuum, we put the conducting slab in some dielectric liquid ?
then the permittivity changes to kappa* epsilon_0, where kappa is the dielectric constant of the liquid. This generally weakens the electric field.
I have been wondering for a long while about how to pronounce that symbol. is that ‘epsilon knot’?
it's actually 'epsilon naught' where naught means zero.
I will go to my teacher it is not a K it is a Kappa 😎
So... as the strength of my electric field increases eps0 goes down?
No, eps0 is fixed for the medium, as strength of electric field increases, the charge on surface also increases to maintain the ratio.
Is air an insulator?
Yes, absolutely. It's a fantastic insulator, but it's dieletric constant (kappa) is pretty close to 1: kappa_air = 1.00059
You deserve 9×10^9 claps
thank you!