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Q.

A magnetized wire of magnetic moment ‘M’ and length ‘l’ is bent in the form of a semicircle of radius ‘r’. The new magnetic moment is

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a

Mπ

b

2Mπ

c

M2π

d

M4π

answer is B.

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Detailed Solution

For semi circle M'= m×2r = Ml2lπ =2Mπ here l=πr

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