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Q.

A magnet of magnetic moment M is rotated through 360o in a magnetic field H. The work done will be

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a

MH

b

2MH

c

2πMH

d

Zero

answer is D.

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Detailed Solution

W=MB(cosθ1-cosθ2); θ1=0o and θ2=360o⇒w=0
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A magnet of magnetic moment M is rotated through 360o in a magnetic field H. The work done will be