The moment of magnet is 1 micro Wb-m and the force acting on each pole in a uniform magnetic field of strength 0.38 oersted is 1.024×10−4N . Distance between the two poles of the magnet is

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1.56×10-4 cm

0.78×10-4 cm

0.37×10-4 cm

1.44×10-4 cm

answer is C.

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Detailed Solution

τ=MB=Fl ⇒l=MBF ⇒l=10−6×0.38×10−41.024×10−4=0.37×10-4cm

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