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As loop of magnetic moment M is placed i...

As loop of magnetic moment `M` is placed in the orientation of unstable equilbirum position in a uniform magnetic field `B`. The external work done in rotating it through an angle `theta` is

A

`-MB(1-cos theta)`

B

`-MB(cos theta)`

C

`MB cos theta`

D

`MB(1-cos theta)`

Text Solution

Verified by Experts

The correct Answer is:
A
`theta_(i)=180^(@),theta_(f)=180^(@)-theta`
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