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

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8 : 1

1:22

3 : 2

4 : 1

answer is A.

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Detailed Solution

For a short magnet at a point along its axial line, magnetic field is given by B = μo4π2Md3⇒B ∝ 1d3 ⇒B1B2=d2d13=48243=81