Two magnetic poles of pole strength `324 milli amp.m.` and `400 milli amp m` are kept at a distance of `10cm` in air. The null point will be at a distance of ……`cm,`on the line joining the two poles, from the weak pole if they are like poles.

Options

A. 4.73
B. 5
C. 6.2
D. 5.27

Answer

A

Explanation

`m_(1)/x^(2)=m_(2)/((d-x)^(2))`