Question

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

• A. Equal to $g$
• B. Less than $g$
• C. Greater than $g$
• D. none

Answer 1

The correct option is B Less than $g$

A metal ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The magnet falls with an acceleration less than $g$

As the magnet falls, the magnetic flux linked with the ring increases. This induces emf in the ring which opposes the motion of the falling magnet, hence $a<g.$