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Q.

A magnet of length 10 cm and pole strength 4×10-4 Am is placed in a magnetic field of induction 2 × 10–5 Weber m–2, such that the axis of the magnet makes an angle 300with the lines of induction. The moment of the couple acting on the magnet is

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a

4 × 10–6 Nm

b

4 × 10–10 Nm

c

3×10−11Nm

d

8 × 10–10 Nm

answer is A.

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Detailed Solution

C=MBsin⁡θ

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