Electric field, field lines, field of point charge

The angle between the electric lines of force and the equipotential surface is :

Two parallel infinite line charges with linear charge densities \(+\lambda\) C/m and \(-\lambda\) C/m are placed at a distance of 2R in free space. What is the electric field mid-way between the two line charges ?

An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is