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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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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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A bar magnet of magnetic moment is placed in a uniform magnetic induction field of . If each pole of the magnet experiences a force of . The length of the magnet is
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