Question

Two infinite linear charges are placed parallel to each other at a distance `0.1 m` from each other. If the linear charge density on each is `5 mu C//m`, then the force acting on a unit length of each linear charge will be:
A. `2.5 N//m`
B. `3.25 N//m`
C. `4.5 N//m`
D. `7.5 N//m`

Answer 1

Correct Answer - C
Force between two line charges On a unit length
`=(2K lambda)/(r) xx lambda=(2xx9xx10^(9)xx(5xx10^(-6))^(2))/(0.1)=4.5 N//m`