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Q.

A magnet of length 0. 1 m and pole strength 10-4 Am is kept in a magnetic field of 30 Wb/m2 at an angle 30o. The couple acting on it is ... x l0-4N m.

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a

7.5

b

3.0

c

1.5

d

6.0

answer is C.

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Detailed Solution

τ=MBsinθ=m x (2l) x B sinθ=10-4 x 0.1 x 30 sin30o =1.5 x 10-4 Nm
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