All Questions
8
questions
2
votes
2
answers
165
views
Energy Conservation when two permanent magnets attract each other
I have a very basic doubt related to energy conservation in a system of magnets. Suppose I have two magnets (bar magnets) of magnetic moment $M$ kept along the line with an initial distance $X_0$ such ...
- 31
3
votes
4
answers
869
views
Why isn't Magnetic force doing any work on the rod?
Consider the situation given below :
The rod (of length $l$ and of some resistance "r") connecting the two rails is given a velocity $v$ in the direction shown. Now since this motion ...
- 8,220
0
votes
0
answers
157
views
How Lenz's law is based on conservation of energy?
To be honest, I understood Lenz's law. It doesn't violate conservation of energy. Kinetic energy gets coverted to electromotive force (EMF). But why?
Like in case of upward thrown ball, kinetic ...
- 435
1
vote
3
answers
107
views
Loss of energy when permanent magnet falls trough coil?
Is there a loss of mechanical energy when a permanent magnet falls trough a coil?
Given a magnet with mass m and a coil with N windings. The coil is placed vertically so the magnet can fall trough. ...
- 15
0
votes
1
answer
86
views
Does an electric field induced by a time varying magnetic field has an energy associated with it?
Consider a time varying magnetic field. This induces an electric field upto infinity as per Faraday law and other related laws.
Is energy stored in this induced electric field?
If so, what kind of ...
- 1,568
2
votes
2
answers
480
views
Energy Conservation: How is Heat generated in a loop with Time Varying Magnetic Field through it?
Consider a circular loop kept in a time-changing magnetic field. We know, via Faraday Law, that EMF is induced across the loop and hence a current appears in the loop. Let there be some Resistance ...
- 1,568
1
vote
2
answers
935
views
If I put an iron nail bear a magnet, a magnetic field would be induced in the iron nail
Now, the iron nail becomes a magnet without rubbing or any other energy-consuming process. Now, if I take the magnetized iron nail near other iron pieces, it would attract them and give them kinetic ...
- 323
1
vote
1
answer
405
views
Energy conservation in jumping ring experiment
Consider Thomson's jumping ring experiment, where a conducting ring is repelled from a coil after you switched a current in the coil on. The following experiment shows a simplified schematics of the ...
- 1,692