Test: Equipotential Surfaces (NCERT) - Grade 12 MCQ

As the electric field in the z-direction is uniform, equipotential surfaces are in xy plane. Hence the potential for given z is constant on x-y plane, for any x in this plane and for any y in this plane. So all are correct.

Electric field,

i.e., equipotential surfaces are closer in regions of large electric fields compared to regions of lower electric field. At sharp edges of a conductor, charge density is more. Therefore electric field is stronger. Hence equipotential surfaces are more crowded.

In a region of constant potential
 (∵ V = constant)
i.e., electric field is zero, so there can be no charge inside the region.

In the region of strong electric fields equipotential surfaces are close together and in the region of weak electric fields, equipotential surfaces are far apart.

Electric field is always perpendicular to the equipotential surface at any point.