Q.

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

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a

6

b

33

c

3(2-3)

d

3

answer is C.

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Detailed Solution

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