Q.
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
answer is D.
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Detailed Solution
For a magnet, B=μ04π.2Mx3 (Nearly)⇒B1B2=x2x12=2x1x3=81 (Approx).
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