A magnet of magnetic moment M is freely ...

A magnet of magnetic moment M is freely suspended in a uniform magnetic field of strength B. The work done in rotating the magnet through an angle `theta` is given by ________

MB sin `theta`

MB cos `theta`

`MB ( 1- cos theta)`

Text Solution

Verified by Experts

The correct Answer is:

`W = - ("Change in P.E")`
` = -[MB cos theta - MB]`
` = MB (1- cos theta)` .

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