A magnet of length 30cm with pole strength 10A−m is freely suspended in a uniform horizontal magnetic field of induction 40×10−6T . If the magnet is deflected by 60o from its equilibrium position, the restoring couple acting on it is :
10.39×10−5Nm
√3×10−5Nm
6×10−5Nm
√5×10−5Nm
A
10.39×10−5Nm
B
√3×10−5Nm
C
6×10−5Nm
D
√5×10−5Nm
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