Q.

A magnet of magnetic moment ‘M’ is in the form of a quadrant of a circle . If it is straightened its new magnetic moment will be

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a

Mπ2

b

22Mπ

c

2Mπ

d

Mπ22

answer is D.

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Detailed Solution

M'=Mθ2sinθ2 ⇒M'==Mπ22sinπ4=Mπ412=Mπ22
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A magnet of magnetic moment ‘M’ is in the form of a quadrant of a circle . If it is straightened its new magnetic moment will be