A bar magnet of length 10 cm and pole strength 20 A-m is deflected through 30o from the magnetic meridian. If earth's horizontal component field is 3204πA/m. The moment of the deflecting couple is

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160 x10-7 Nm

320π x107 Nm

320 x10-7 Nm

160π x10-7 Nm

answer is C.

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Detailed Solution

B=μ0H=4π x 10-7 x 3204πτ=MB sinθ=20 x 10-1 x 320 x 10-7 x 12=320 x 10-7 Nm

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