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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 ________

A

B M

B

M B sin `theta`

C

M B cos `theta`

D

M B `(1- cos theta)`

Text Solution

Verified by Experts

The correct Answer is:
D
W `=int_(0)^(theta)taud theta=int_(0)^(theta) MB sin thetad theta`
`= MB [-cos theta]_(0)^(theta)= MB [1-costheta]`
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