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

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

TS EAMCET 2020

Solution:

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.