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Q.

The magnetic moment of a magnet is 0.1 Am2 and force acting on each pole in a uniform magnetic field of strength 0.36 oersted is 1.224 x 10-4N. The distance between the poles of the magnet is

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a

1.56 cm

b

0.78 cm

c

2.50 cm

d

1.17 cm

answer is C.

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Detailed Solution

We know that F= mB
∴m=FB=1⋅224×10−40⋅36×10−4=4Am
Further, M= m(2l) or 2l = M/m
∴2l=0⋅14m=104cm=2⋅50cm

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The magnetic moment of a magnet is 0.1 Am2 and force acting on each pole in a uniform magnetic field of strength 0.36 oersted is 1.224 x 10-4N. The distance between the poles of the magnet is