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Q.

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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a

8 : 1

b

1:22

c

3 : 2

d

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
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