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A bar magnet with magnetic moment 2.5 xx...

A bar magnet with magnetic moment `2.5 xx10^3 J T^(-1)` is rotating in horizontal plane in thespacecontaining magnetic induction` B = 4xx10^(-5)` T. The work done in rotating the magnet slowly from a direction parallel to the field to a direction `45^@` from the field,is (in joule)

A

0. 07

B

0.2

C

0.03

D

0.02

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