Point charges, radidiation reaction, and quantum mechanics

Moving point charges generate nonsinusoidal electromagnetic fields, and the motion of the charges is in turn determined by the fields. The full dynamical problem includes radiation reaction, which is discussed here. Nonsinusoidal fields are also associated with relativistic quantum mechanics, where the notion of causality is extended. Cerenkov radiation and the Aharonov-Bohm effect are two other topics.