Write two properties of equipotential surfaces, Depict equipotential surfaces due to an isolated point charge. Why do the equipotential surfaces get closer as the distance between the equipotential surface and the source charge decreases?

Characteristics of equipotential surfaces :
(i) These are always perpendicular to field lines.
(ii) No work is done in moving the test charge from
one point of equipotential surface to the other. On reducing the distance of source charge, the electric field becomes strong and equipotential surface comes closer.
For an isolated point charge, the equipotential surfaces are shown below