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

`M/2`

B

`M`

C

`2M`

D

`M/sqrt(2)`

Verified by Experts

The correct Answer is:

D

`SN=` Length of the magnet `=L/sqrt(2)`
Before bending `M=mxxL`
After bending `M'=mxxL/sqrt(2) =(mL)1/sqrt(2)=M/sqrt(2)`

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