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Magnetic Field Due to Current in a Solenoid

The maximum w...

Question

The maximum work done in rotating a bar magnet of magnetic moment M when placed in a uniform magnetic field B is

A

MB

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B

- MB

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C

2MB

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D

Zero

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Solution

The correct option is C 2MB
W = $U_{f}$ – $U_{i}$ = MB – (–MB) = 2MB

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