A short bar magnet of length 1 cm has points A & 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:
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a
8
b
122
c
3
d
4
answer is A.
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Detailed Solution
For a short magnet at a point along its axial lineB=μ04π.2Mr3 ∴BABB=r2r13 ⇒BABB=48243=81=8 ∴ BA:BB=8:1