Question

A closed 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 when it comes close to the center of metal ring. (g = acceleration due to gravity)

• A. more than g
• B. equal to g
• C. less than g
• D. either (a) or (c).

Answer 1

Answer: (C)

less than g

Answer 2

As the magnet falls, changing magnetic flux induces a current in the ring. By Lenz's law, this induced current creates a magnetic field that opposes the magnet's motion, resulting in an upward repulsive force. This upward force reduces the net downward force on the magnet, making its acceleration less than 'g'.