We represent equipotential surfaces by dashed curves and lines of force by full line curves.Between any two adjacent equipotential surfaces,we assume a constant potential difference.

1. The equipotential surfaces of a single point charge are concentric spherical shells with their centres at the point charge.

2. The equipotential surfaces of two equal and opposite charges, seperated by small distance are close together in the region in between the two charges.

3. The equipotential surfacesof two equal and same charges separated by small distance  are far apart in the region between two charges.

4. The equipotential surfaces for a uniform electric field , are equidistant parallel planes perpendicular to the lines of force.