Equipotential surfaces at a very large distance from a collection of charges whose total sum is not zero are approximately . . . . . . .

Describe schematically the equipotential surfaces corresponding to
$(a)$ a constant electric field in the $z$-direction,
$(b)$ a field that uniformly increases in magnitude but remains in a constant (say,$z$) direction,
$(c)$ a single positive charge at the origin,and
$(d)$ a uniform grid consisting of long equally spaced parallel charged wires in a plane.

The figure shows three points $A, B$ and $C$ in a uniform electric field $(\overrightarrow{E})$. The line $AB$ is perpendicular to $BC$ and $BC$ is parallel to $\overrightarrow{E}$. If $V_A, V_B$ and $V_C$ are the potentials at $A, B$ and $C$ respectively,then the correct option is

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

Show that the direction of the electric field at a given point is normal to the equipotential surface passing through that point.

Which of the following statements is not true?