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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4 : 1 exactly

4 : 1 approx

8 : 1 exactly

8 : 1 approx

answer is D.

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Detailed Solution

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