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A magnet of magnetic moment M is situated with its axis along the direction of a magnetic field of strength B. The work done in rotating it by an angle of will be
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Correct option is D
Work done = MB(cos θ1 - cosθ2)θ1=0o and θ2=180o⇒W=MB(cos0o-cos180o)=2MB
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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 in C.G.S. units is
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