Question

A bar magnet having magnetic moment $M$ is bent as an arc. Its magnetic moment

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

Answer 1

Answer: (A)

Magnetic moment of a bar magnet,
mathbf $M=m(21)$
$=$ pole strength times distance between poles When bar magnet is bent as an arc distance between poles decreases whereas pole strength remains same.
So, its magnetic moment also, decreases.