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Points A and B are situated along the extended axis of 2cm long bar magnet at a distance x and 2x respectively. From the pole nearer to the points, the ratio of the magnetic field at A and B will be

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a
4 : 1 exactly
b
4 : 1 approx
c
8 : 1 exactly
d
8 : 1 approx

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detailed solution

Correct option is D

For a magnet,  B=μ04π.2Mx3 (Nearly)⇒B1B2=x2x12=2x1x3=81  (Approx).

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