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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(1- sin theta)`

B

`MB sin theta`

C

`MB cos theta`

D

`MB (1- cos theta)`

Text Solution

Verified by Experts

The correct Answer is:
D
`W= - MB (cos theta_(f)- cos theta_(i)) = MB (1- cos theta)`
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