Q.

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

answer is B.

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Detailed Solution

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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