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Q.

A magnet 10 cm long and having a pole strength of 2 amp-m is deflected through 30o from the magnetic meridian. The horizontal component of earth's induction is 0.32 x 10-4 T. The value of deflecting couple is

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a

6 x 10-7 N-m

b

32 x 10-7 N-m

c

48 x 10-7 N-m

d

64 x 10-7 N-m

answer is B.

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Detailed Solution

Here M=10×10−2×2=20×10−2=0⋅2 amp-m 2∴τ=MBsin⁡θ=0⋅2×0⋅32×10−4sin⁡30∘=0⋅2×0⋅32×10−4×(1/2)=32×10−7N−m.
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