A bar magnet of length 1 cm has points A and B along its axis at distance of 24 cm and 48 cm on the opposite sides. Ratio of magnetic fields at these points will be
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a
8
b
122
c
3
d
4
answer is A.
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Detailed Solution
Both points A and B lie on axial position. ∴B∝1d3 ⇒BABB=dB3dA3=48243=8