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