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Question

A magnetised wire of magnetic moment M and length L is bent in the form of a semicircle of radius r. Then its magnetic moment is:


A
2Mπ
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B
2M
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C
Mπ
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D
0
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Solution

The correct option is A 2Mπ
On bending a wire it pole strenth is not affected but its moment changes.
Magnetic moment of straight wire M=ml
Radius of bent wire r=lπ
Magnetic moment of bent wire
MNew=m(2r)=m2lπ=2Mπ

790500_15075_ans_36b0b880d5b14d85b69902431f82440f.JPG

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