Geoffrey Brooker
Abstract
Abstract “Electromagnetic energy” takes a hard look at the reasoning by which energy density and energy flow (Poynting vector) are deduced from Maxwell's equations. What can be proved and what, lacking proof, can be usefully said? It is argued that the conventional division of energy into density and flow is unproven but does not mislead. Picture of a pillbox.
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Abstract “Electromagnetic energy” takes a hard look at the reasoning by which energy density and energy flow (Poynting vector) are deduced from Maxwell's equations. What can be proved and what, lacking proof, can be usefully said? It is argued that the conventional division of energy into density and flow is unproven but does not mislead. Picture of a pillbox.
Key concepts: Poynting vector, Energy flow, Poynting's theorem, Energy (signal processing), Physics, Energy density, Flow (mathematics), Energy current