All Questions
11
questions
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28
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Which equation is most valid for finding power dissipation in a induced magnetic pendulum system?
Considering a set up where a conducting pendulum oscillates between two permanent magnets, I want to somehow calculate the power dissipated by the magnetic braking force the magnets provide, in order ...
1
vote
1
answer
35
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Getting the force somehow using magneticfield force (tesla)
First off, sorry if not everything makes sense, english isn't my first language so some scientific terms may sound weird if they're in English. For a project we are making a coil gun. So we get a ...
- 11
0
votes
1
answer
58
views
Why the magnet travels through solenoid faster if we connect a bulb to a solenoid
When a magnet travels linearly through a solenoid at a fast enough velocity if the ends of solenoid are connected to each other, the induced EMF generated and Lenz Law the solenoid opposes the motion ...
- 25
1
vote
1
answer
67
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Tension generated in a metallic loop placed in a time varying magnetic field [closed]
We have a metallic wire circular loop of resistance $R$, having radius $a$, placed in a magnetic field $\bf{\vec{B}(t)}$. The magnetic field is perpendicular to the plane of the wire.
The magnetic ...
2
votes
1
answer
225
views
Magnetism rail problem
A circuit with resistance $R$ is given. The emf $E$ in the circuit is produced by a conducting rod moving with constant velocity in a uniform perpendicular magnetic field. The rod is sliding on ...
- 69
1
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1
answer
37
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Can you induce motion by changing magnetic field on a body which isn't magnetic?
In this video demonstration of Lenz's law, the narrator starts with a substance which doesn't respond to the magnetic field of a bar magnet yet when he moves the bar magnet in relative motion to the ...
- 7,980
1
vote
1
answer
64
views
Contradiction in Faraday's law and Motional EMF
Consider two parallel conducting frictionless rails in a gravity free rails parallel to x axis. A movable conductor PQ( y direction) of length $l$ slides on those rails. The rails are also connected ...
- 517
1
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1
answer
985
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The 2 Forces on the Conductor having induced Motional EMF
Ok, a conductor PQ is placed on a U-shaped conducting rails situated in a magnetic field, B directed inside the plane of paper.
When it is moved to left with velocity ,v, the free electrons will ...
- 356
4
votes
2
answers
417
views
Why would a moving infinite region of magnetic field exert an electric force?
I'm confused about the Lorentz force in relation to the frame of reference. There are many questions about that here, but I still don't get it. I've tried to break it down to the most basic example.
...
- 165
1
vote
2
answers
1k
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Torque on a charged ring
I have been studying electromagnetic induction. As I understand, a magnetic field will exert a force on a moving charge. What I would like to know is whether a changing magnetic field will exert a ...
- 1,582
1
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2
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396
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What physical forces allows for electromagnetic induction [duplicate]
In electromagnetic induction, what force is actually doing the work? what physical force actually drives the electrons around the circuit?
Let's say we have a coil and an increasing magnetic field ...
- 815