The angle between an equipotential surface and the electric lines of force is .......$^o$.

Find the equation of the equipotential surface for an infinite cylinder of radius $r_0$,carrying a charge of linear density $\lambda$.

If a unit charge is taken from one point to another point over an equipotential surface,then

$A$ circle of radius $R$ is drawn with a charge $+q$ at the centre. $A$ charge $q_0$ is moved from point $B$ to $C$ along the circumference of the circle. The work done is:

For an electric field that increases in magnitude along the $x$-direction,what is the nature of the equipotential surfaces?

The diagrams below show regions of equipotentials. $A$ positive charge $q$ is moved from $A$ to $B$ in each diagram.