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 |
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