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Magnetic moment of bar magnet is M. The ...

Magnetic moment of bar magnet is M. The work done to turn the magnet by `90^(@)` of magnet in direction of magnetic field B will be

A

Zero

B

`1/2 ` MB

C

`2` MB

D

MB

Text Solution

Verified by Experts

The correct Answer is:
D

Work done
`W = MB (1 - cos theta)`
`theta = 90^@`
`therefore W = MB`
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