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A flat coil carrying a current has a mag...

A flat coil carrying a current has a magnetic moment `mu`. It is initially in equilibrium, with its plane perpendicular to a magnetic field of magnetic `B`, If it now rotated through an angle `theta`, the work done is

A

`mu B theta`

B

`mu B cos theta`

C

`mu B(1 - cos theta)`

D

`mu B sin theta`

Text Solution

Verified by Experts

The correct Answer is:
C
`W_(1 rarr 2) = muB (cos theta_(1) - cos theta_(2)) = muB(cos 0 - cos theta)`
`= muB(1 - cos theta)`
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