ABSTRACT

The radiation fields have importance which goes beyond that. Radiation has so many of the physical attributes associated with matter that it receives a status almost at par with it in classical physics. In quantum physics this status is elevated to full emancipation when the photon emerges as a full-fledged particle, just as "fundamental" as any charged particle of matter. The chapter aims to express the energy and momentum carried by the radiation in terms of the dynamical variables of the moving source charge. It provides a few examples of radiation emitted by a charge in motion. These motions are of very special nature and deserve our attention for various reasons.