The shape of equipotential surface due to point charge is always spherical.

The electric field lines of a positive charge is as shown in figure. What is the shape of equipotential surface near the charge ?

The equipotential surface through a point is normal to the electric field at that point.

What is the work done to move a charge on an equipotential surface?

The equipotential surface through a point is normal to the electric field at that point.

What is meant by equipotential surface?

Define:

$\left(\mathrm{b}\right)$ Equipotential surface.

Draw equipotential surface due to an isolated point charge$\left(-q\right)$ and depict the electric field lines.

The equipotential surface through a point is normal to the electric field at that point.

Draw the equipotential surfaces for a uniform electric field.

What is the direction of electric field with respect to an equipotential surface?