A bar magnet of magnetic moment 104J/T is free to rotate in a horizont – McqOptions

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1.	A bar magnet of magnetic moment 104J/T is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of 4×10?5 T to a direction 60° from the field will be [MP PET 1995]
A.	0.2 J
B.	2.0 J
C.	4.18 J
D.	2 × 102 J
Answer» B. 2.0 J

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