Electrostatic fields are E-fields which do not change with time, which happens when the charges are stationary.
The electric field at a point E(r) is equal to the negative gradient of the electric potential Φ(r), a scalar field at the same point:
and force is the negative of potential energy gradient:
If several spatially distributed charges generate such an electric potential, e.g. in a solid, an electric field gradient may also be defined.
Read more about this topic: Electric Field
... suggests similarities between the electric field E and the gravitational field g, so sometimes mass is called "gravitational charge" ... Similarities between electrostatic and gravitational forces Both act in a vacuum ... Differences between electrostatic and gravitational forces Electrostatic forces are much greater than gravitational forces for natural values of charge and mass ...
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