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Q.

Two magnets of moments M1 and M2 are rigidly fixed together at their center's so that their axes are inclined to each other. This system is suspended in a magnetic field of induction ‘B’ so that M1 makes an angles θ1  and M2 makes an angles θ2 with the field direction and unlike poles on either side of the field direction. The resultant torque on the rigid system is

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a

BM1sinθ1+M2sinθ2

b

BM1cosθ2+M2cosθ1

c

BM1cosθ1+M2cosθ2

d

BM1sinθ2+M2sinθ1

answer is A.

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Detailed Solution

Net torque

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τ=M1Bsinθ1+M2Bsin180θ2

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