A circular loop of wire is suspended by a thread. A permanent magnet is moved at

Question

A circular loop of wire is suspended by a thread. A permanent magnet is moved at a constant speed toward the center of the loop as shown. The loop of wire swings away from the magnet. Listed below are a number of changes to this original situation. The possible choices for how the change will affect the loop are: The loop will swing away from the magnet faster than the original case. The loop will swing away from the magnet slower than the original case. The loop will swing toward the magnet. There will be no change in the behavior of the loop. The loop will not move in this case. For each change 1-6 below, identify how the behavior of the loop is altered. The magnet is moved toward the loop with twice the velocity.____ A small gap is cut in the loop.______ The magnet is flipped around so the south pole is closer to the loop.____ A plastic loop is used instead of a metal one.____ A stronger magnet is used._____ The magnet (with the north pole still near the loop) is moved away from the loop at the same speed. ______

Explanation / Answer

The coil experiences a repulsive force due to the magnetic field of the induced current since the flux is changing as the permanent magnet is getting closer. This repulsion is explained by Lenz’s law.

1 )A ( by lenz law)

2 ) e

3 ) A

4 ) E

5 ) A

6 ) C

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