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Q.

The couple acting on a bar magnet of pole strength 2 Am when kept in a magnetic field of intensity 10 A/m, such that axis of the magnet makes an angle 300 with the direction of the field is 80×10-7 Nm . The distance between the poles of the magnet is

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a

2π m

b

π2 m

c

63.36 m

d

12π m

answer is A.

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Detailed Solution

C = MBsinθ= m×2l×μ0×H×sinθ

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