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If a bar magnet moment M is freely suspe...

If a bar magnet moment M is freely suspended in a uniform magnetic field of strength field of strength B, then the work done in rotating the magent through an angle `theta` is

A

MB

B

MB sin `theta`

C

MB cos `theta`

D

`MB ( 1- cos theta)`

Text Solution

Verified by Experts

The correct Answer is:
D
`W = - ("Change in P.E")`
` = -[MB cos theta - MB]`
` = MB (1- cos theta)` .
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