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A bar magnet of lenth l and magnetic dip...

A bar magnet of lenth `l` and magnetic dipole moment 'M' is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be

A

`M`

B

`3/piM`

C

`2/piM`

D

`M/2`

Text Solution

Verified by Experts

The correct Answer is:
B
`M=mL`
`L=pi/3xxrimpliesr=(3L)/pi`
`M^(')=mxxr=m(3L)/pi=(3M)/pi`
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