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A magnet of m magnetic moment is rotate ...

A magnet of m magnetic moment is rotate up to `360^@` in magnetic field H then the work done is……………

A

0

B

mH

C

2mH

D

2`pi`mH

Text Solution

Verified by Experts

The correct Answer is:
A
`W=mH(costheta_1-cos theta_2)`
`=mH(cos 0^@-cos 360^@)`
`=mH(1-1)`
=0
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