Q.
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
Mπ
d
Mπ
answer is B.
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Detailed Solution
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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