A bar magnet is falling through a loop of wire with constant velocity.The south pole enters first.As the magnet leaves the wire,the induced current (as viewed from above):
A)is clockwise.
B)is counterclockwise.
C)is zero.
D)is along the length of the magnet.

Question

Quizplus · Accepted Answer

According to Faraday's law, a changing magnetic field (in this case, a decreasing field as the magnet moves away) induces an electric current in a nearby conductor. The direction of this induced current follows Lenz's law, which states that the induced current will flow in a direction that opposes the change that produced it. When the south pole of the magnet enters the loop, a magnetic field is produced that induces a current in the loop. This current will flow counterclockwise as viewed from above, in a direction that opposes the motion of the south pole into the loop. As the magnet leaves the loop, the induced current will continue to oppose the motion of the magnet and will flow clockwise as viewed from above.

A Bar Magnet Is Falling Through a Loop of Wire