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A magnetic dipole is situated in the dir...

A magnetic dipole is situated in the direction of a magnetic field. What is its potential energy? If it is rotated by `180^@`, then what amount of work will be done?

Text Solution

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P.E. of dipole `=-MB cos 0^@=-MB`
Work done `=MB(cos 0^@-cos 180^@)`
`=MB(1+1)=2MB`.
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