Abstract

This chapter discusses the energy–momentum tensor in macroscopic electrodynamics. It discusses the applications of the energy and momentum conservation laws to the radiation of electromagnetic wave (photons) in a medium. The tensor is the energy–momentum tensor for a uniform medium at rest. Abraham force is genetically connected with the force due to the magnetic field (Lorentz force) acting upon the displacement current. In the field of applications of the energy and momentum conservation law, usually only two points are important: (1) what is the energy and momentum lost (or gained in absorption) in the emitting particle or system and (2) what is the field energy emitted in a given direction. The chapter further discusses the problems of the energy–momentum tensor and the forces in a medium.

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