1.

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» 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`


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