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Q.

A bar magnets of length 1 cm has point A & B along its axis at distances of 12 cm & 24 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 bar magnet at a point along its axial point,   B=μ04π.2Mr3∴B1B2=r2r13=24123=23=8 .
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