A magnet 10 m long and having a pole strength 2 amp m is deflected through 30o from the magnetic meridian. The horizontal component of earth's induction is 0.32×10−4 tesla then the value of deflecting couple is:
A
32×10−7Nm
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B
16×10−7Nm
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C
64×10−7Nm
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D
48×10−7Nm
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Solution
The correct option is B32×10−7Nm M=2×10100=0.2 Value of restoring couple =MHsinϕ