A bar magnet of 5  cm long having a pole strength of 20  A . m. is deflected through 30^∘ from th...

Описание: A bar magnet of 5  cm long having a pole strength of 20  A . m. is deflected through 30^∘ from the magnetic meridian. If H=320/4 πA / m, the deflecting couple is
a. 1.6 × 10^-4Nm
b. 3.2 × 10^-5Nm
c. 1.6 × 10^-5Nm
d. 1.6 × 10^-2Nm

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