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A magnetised wire of magnetic moment 'M'...

A magnetised wire of magnetic moment `'M'` and length `'l'` is bent in the form of a semicircle of radius `'r'`. The new magnetic moment is

A

`(2M)/(pi)`

B

2M

C

`(M)/(pi)`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
A
On bending a wire its pole strength remains unchanged, whereas its magnetic moment changes. New magnetic moment,
`M'=m(2r)=m((2l)/(pi))=(2M)/(pi)`
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