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Question

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 0.32×104 tesla then the value of deflecting couple is:

A
32×107Nm
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B
16×107Nm
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C
64×107Nm
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D
48×107Nm
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Solution

The correct option is B 32×107Nm
M=2×10100=0.2
Value of restoring couple =MHsinϕ
=0.2×0.32×104sin30o
=0.2×0.32×104×12
=32×107Nm

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