Force between two unit pole strength placed at a distance of one metre is

Options

A. `1N`
B. ` 10^(-7)/(4pi)N`
C. ` 10^(-7) N`
D. ` 4pixx10^(-7) N`

Answer

C

Explanation

`F=10^(-7)xxm^(2)/r^(2)=(10^(-7)(1)^(2))/(1)^(2)=10^(-7)N`