A metal ring is held horizontally and bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet

Options

A. equal to g
B. less than g
C. more than g
D. depends of on the diameter of the ring length of magnet

Answer

B

Explanation

Acceleation of the magenet will not be equal to g. It will be less than g. This is because, as the magnet falls, amount of mgnetic flux linked with the ring changes.
An induced emf is developed in the ring which opposes the downward motion of the magnet.