Q.

A small bar magnet of moment M is placed in a uniform field B. If magnet makes an angle of 30o with field, the torque acting on the magnet is

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a

MB

b

MB2

c

MB3

d

MB4

answer is B.

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Detailed Solution

τ= MB sinθ = MBsin30o =MB2
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A small bar magnet of moment M is placed in a uniform field B. If magnet makes an angle of 30o with field, the torque acting on the magnet is