1. Imagine that you have a closed loop of wire sitting on a table and a bar magn
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Question
1. Imagine that you have a closed loop of wire sitting on a table and a bar magnet in your hand. You are allowed to move the magnet any way you’d like, but you may not touch the wire. Is there a way for you to produce a current in the wire? If so, how can you do it? If not, why not?
2. Imagine you have two wire loops lying next to each other on a table. The first one is connected to an AC power supply (like a wall outlet), producing a time-varying current through the wire, which in turn produces a time-varying magnetic field. The second wire loop reacts to this time varying magnetic field according to Faraday's law. Describe the current produced in the second loop.
3. Imagine you have two wire loops lying next to each other on a table. The first one is connected to a DC power supply (like a battery), producing a constant current through the wire, which in turn produces a magnetic field. The second wire loop reacts to this magnetic field according to Faraday's law. Does the second wire loop have any current flowing through it? Why/how is this situation different than with the AC power supply in the previous question?
Explanation / Answer
1) bar magnet will have its own magnetic field, and if bar magnet is moved relative to the closed loop in such a way that the flux linked with the loop changes (increases or decreases) then there will be emf induced in the loop that will oppose the change in flux and so th current will also be induced in the loop.
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