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Two like magnetic poles of strength 10 and 40 SI units are separated by a distance 30 cm. The intensity of magnetic field is zero on the line joining them 

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a
At a point 10 cm from the stronger pole
b
At a point 20 cm from the stronger pole
c
At the mid-point
d
At infinity

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detailed solution

Correct option is B

Suppose magnetic field is zero at point P which lies at a distance x from 10 units pole. Hence, at Pμ04π.10x2=μ04π.4030-x2⇒x=10 cmSo, from stronger pole distance is 20 cm.

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