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An iron rod of length L and magnetic moment M is bent in the form of a semicircle. Now its magnetic moment will be

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a
M
b
2Mπ
c
d

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detailed solution

Correct option is B

On bending a rod its pole strength remains unchanged where as its magnetic moment changes.New magnetic momentM'=m(2R)=m2Lπ=2Mπ

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