If a bar magnet is falling through a loop of wire,the induced current in the loop of wire sets up a field which exerts a force on the magnet.This force between the magnet and the loop will be attractive when
A)the magnet enters the loop.
B)the magnet is halfway through.
C)the magnet is leaving the loop.
D)never.

Question

Quizplus · Accepted Answer

When the magnet is entering the loop, the induced current initially opposes the motion of the magnet, resulting in a repulsive force. When the magnet is halfway through, the induced current is maximum and the force is zero. When the magnet is leaving the loop, the induced current opposes the decrease in the magnetic field, resulting in an attractive force between the magnet and the loop. Therefore, the best choice is C).

If a Bar Magnet Is Falling Through a Loop of Wire,the