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Question

A bar magnet of length 3 cm has points A and B along its axis at distances of 24 cm and 48 cm on the opposite sides. Ratio of magnetic fields at these points will be

A
8
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B
122
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C
3
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D
4
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Solution

The correct option is A 8
Both points A and B lying on the axis of the magnet and on axial position
B1d3BABB=(dBdA)3=(4824)3=81

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