Question

A bar magnet of moment $M$ is bent in arc, its moment

• A. decreases
• B. increases
• C. does not change
• D. may change

Answer 1

The correct option is A decreases

Magnetic moment of a magnet=$ml$
where, $m=$ pole strength
$l=$effective distance between the two poles

When it the magnet is bent in arc, the effective distance between the two poles decreases and so the Magnetic Moment.