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The dipole moment of a short bar magnet is . The magnetic field on its axis at a distance of 0.5 metre from the centre of the magnet is
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Correct option is C
B=μ04π2Md3=10-7 x 2 x 1.250.53=2 x 10-6 N/A-m
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The distance of two points on the axis of a magnet from its centre are 10cm and 20cm, respectively. The ratio of magnetic intensity at these points is 12.5 : 1. The length of the magnet will be
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