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A bar magnet of length l and magnet dipo...

A bar magnet of length l and magnet dipole moment M is bent in the form of an arc. The new magnetic dipole moment is

A

`3/piM`

B

`2/piM`

C

`M/2`

D

M

Text Solution

Verified by Experts

The correct Answer is:
A
`M.=mxxr`
Now M = ml
and `pi/3=l/r`
i.e, `r=3/pil`
`M.=(m3l)/pi=3/piM`
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