Is there any way to calculate the potential by integrating the E? Your videos are amazing Professor
@doubleeagle243
3 жыл бұрын
Sir if a person inside a room there is north and south pole facing magnet on the opposite wall...and that wall saparation is 1 light year(imagine)...if that room is in space with no roof...a charge particle is there (just above the magnetic field..lets suppose room is moving with constant velocity so person feels that charge particle comes down..let another person outside the room who see room is moving up and charge in rest...for inside person a charge particle come down ..entre in magenetic feild and make semi circle and go upwardin this case room slightly deaccelerate down during this event for outside person charge get kinetic energy ((rest to get velocity)) and there is 1 source for kinetic energy ((room))...so that reaction force of charge is on magnet but when??..after 1 sec because no one cross limit of speed of light..if it happen then for 1 sec energy not conserved if charge move and after 1 sec room deaccelerate ((see by outside person))..or it happen instantaneously???..soo plzzzzz answer my question🙏..i am 12 passout student searching for college...please answer ❤️
@dr.sciencesc.d3088
9 жыл бұрын
Since we found V(a), could we find the Electric Field by taking -dV/da ? In the problem in the video?
@lecturesbywalterlewin.they9259
9 жыл бұрын
+Dr. Science Sc.D E is a vector. if you calculated -dV/da you have no information on the direction. I did calculate the net E and I find E_y=0, E_x=Q/(2*pi^2*eps_o*a^2). If you calculate -dV/da you will find something else with NO information about the direction.
@atalantinopieva
8 жыл бұрын
+Lectures by Walter Lewin. They will make you ♥ Physics. could E be Q/(2*pi^2eps_0*a^2) since I integrated cos(tetha) dtetha from 0 to pi/2 for 2 times?
@dr.sciencesc.d3088
8 жыл бұрын
+Dr. Science Sc.D For the electric field is got that E_x = -Q/(2pi^2 epsilon_o * a^2). I integrated with an upper bound of 3pi/2 and lower bound of pi/2. Should I ignore the minus sign I received or does this indicate the direction?
@josepcodina2684
2 жыл бұрын
@@atalantinopieva I think that's right. I did the same as you, though a few years later.
@balree
3 ай бұрын
Sir, Why 2:03 is 4πa ? where did that come from? I know distance from the charge to that point p is a, but what is 4π?
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