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Q.

A bar magnet has a magnetic moment 2.5 JT-1 and is placed in a magnetic field of 0.2 T. Work done in turning the magnet from parallel to antiparallel position relative to the field direction is

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a

0.5 J

b

1 J

c

2.0 J

d

Zero

answer is B.

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Detailed Solution

Ui=−MBUf=MB

Question Image

W=ΔU=2MB=2×2.5×0.2=1J

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A bar magnet has a magnetic moment 2.5 JT-1 and is placed in a magnetic field of 0.2 T. Work done in turning the magnet from parallel to antiparallel position relative to the field direction is