Electric Field of Point Charge

The electric field of a point charge can be obtained from Coulomb's law: The electric field is radially outward from the point charge in all directions. The circles represent spherical equipotential surfaces.

The electric field from any number of point charges can be obtained from a vector sum of the individual fields. A positive number is taken to be an outward field; the field of a negative charge is toward it.

This electric field expression can also be obtained by applying Gauss' law.

Other electric field geometries

Multiple point charges