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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=MB1−cosθ=20×0.31−cos30°=61−32=32−3
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