Q.

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

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a

MH

b

MH2

c

MH3

d

MH4

answer is B.

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Detailed Solution

τ=MH sinθ=MH sin30o=MH2
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A small bar magnet of moment M is placed in a uniform field H. If magnet makes an angle of 30° with field, the torque acting on the magnet is