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A magnet of magnetic moment 20 C.G.S. units is freely suspended in a uniform magnetic field of intensity 0.3 C.G.S. units. The amount of work done in deflecting it by an angle of 30o in C.G.S. units is

a
6
b
33
c
3(2-3)
d
3

detailed solution

Correct option is C

Work done, W=MBH(1- cos θ)= 20 x 0.3(1 -cos30o) = 61-32=3(2-3)

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