A magnet of magnetic moment M is situate...

A magnet of magnetic moment `M` is situated with its axis along the direction of a magnetic field of strength `B`. The work done in rotating it by an angle of `180^(@)` will be

`-MB`

`+MB`

`0`

`+2MB`

Text Solution

Verified by Experts

The correct Answer is:

Work done `MB(cos theta_(1)-cos theta_(2))`
`theta_(1)=0^(@)` and `theta_(2)=180^(@)`
`implies W=MB(cos0-cos180)=2MB`

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