Question

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

• A. more than $g$
• B. equal to $g$
• C. less than $g$
• D. Data not sufficient to predict

Answer 1

The correct option is C less than $g$

When the magnet is dropped through the ring, due to changing magnetic flux an induced current is developed in the ring in the direction opposing the motion of the magnet (Lenz's law). Therefore, this induced current decreases the acceleration of the bar magnet.