Electrostatics

Electrostatics is the branch of physics that deals with the force exerted by a static (i.e. unchanging) electric field. Because of its relationship and interaction with magnetism, the two fields are often combined as electromagnetism.

Coulomb's law

The fundamental equation of electrostatics is Coulomb's law, which describes the force between two point charges:

Electric potential (also known as voltage) is another common and significant topic in electrostatics. Poisson's equation gives the relationship between charge distribution and potential: