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Question

Magnetic moment of bar magnet is M. The work done in turning the magnet by 90o in direction of magnetic field B will be
  1. Zero
  2. MB
  3. 12MB
  4. 3MB

A
12MB
B
Zero
C
3MB
D
MB
Solution
Verified by Toppr

Potential energy of a magnetic moment at an angle θ with the magnetic field = MBcosθ
Thus work done in rotating from angle θ1 to θ2=MB(cosθ1cosθ2)
=MB(cos0cos90)
=MB(10)
=MB

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