Q.

A short bar magnet is placed in a uniform magnetic field. If the work done to turn the magnet from the direction of field to normal to field is W then potential energy of the magnet when it is in stable equilibrium position is

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a

zero

b

W

c

W/2

d

W

answer is B.

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Detailed Solution

W=MBcosθ1cosθ2

=MBcos0cos90=M.B

U=M¯.B¯=MBcosθ

U=W

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