Dear professor, I have a tough time with the typical problem of a circuit with a moving bar in a orthogonal B field. Let the circuit have no R, but a self inductance L. I have an induced emf with current in the direction suggested by Lenz's Law bacause of the change in the magnetic flux, but then there's another inducted emf by the self inductance. So it's reasonable to write down the sum of the two = 0. But I'm making a mess trying to fit those into faraday's law (I have two sources of induced emf). Thank you for your time, you are a true inspiration.
The closed loop integral of E dot dL is NOT zero if there are changing magnetic fluxes in your circuit. Kirchhoff's Loop Rule does NOT apply in that case. KLR is a special case of Faraday's law namely when the Curl(E)=0. Watch my lecture 16 of 8.02 !!!
😘😘😘 my favourite lecture in 8.02
Dear professor, I have a tough time with the typical problem of a circuit with a moving bar in a orthogonal B field. Let the circuit have no R, but a self inductance L. I have an induced emf with current in the direction suggested by Lenz's Law bacause of the change in the magnetic flux, but then there's another inducted emf by the self inductance. So it's reasonable to write down the sum of the two = 0. But I'm making a mess trying to fit those into faraday's law (I have two sources of induced emf). Thank you for your time, you are a true inspiration.
The closed loop integral of E dot dL is NOT zero if there are changing magnetic fluxes in your circuit. Kirchhoff's Loop Rule does NOT apply in that case. KLR is a special case of Faraday's law namely when the Curl(E)=0. Watch my lecture 16 of 8.02 !!!
Sir you made a mistake at 15:19 , it should be -IR instead of IR because you are moving from low potential to high potential.
you are mistaken. The current is counter clockwise thus Va - Vb = IR
Hi professor i want to ask you how have you known the direction of E field in the resistor wich is pointing from a to b ?
E field is from high potential to low potential
12:40 when you say the self inductance is made of superconducting wire, is that referring to the wire that makes up the solenoid?
yes
Lectures by Walter Lewin. They will make you ♥ Physics. If it was not a superconductor would it be ok to assume that the resistance is negligibly low?
@@studywithjosh5109 if it is negligbly low that is fine. But be careful, you have to make sure that it is *negligibly low.*
Lectures by Walter Lewin. They will make you ♥ Physics. Great thanks!
Very good. Thanks 🙏🙏🙏🙏🙏
Most welcome