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In electrodynamics, Poynting's theorem is a statement of conservation of energy for electromagnetic fields developed by British physicist John Henry Poynting. It states that in a given volume, the stored energy changes at a rate given by the work done on the charges within the volume, minus the rate at which … See more
In a macroscopic medium, electromagnetic effects are described by spatially averaged (macroscopic) fields. The Poynting vector in a macroscopic medium can be … See more
The derivation of the statement is dependent on the assumption that the materials the equation models can be described by a set of See more
1884John Henry Poynting develops the theorem of conservation of energy for electromagnetic fields.1900s-1910sVarious physicists, such as Lorentz, Abraham, and Minkowski, derive alternative forms of Poynting's theorem for different media and field representations.1930s-1940sPoynting's theorem is applied to antenna theory and radiation problems, using complex phasor notation and harmonic fields.It is possible to derive alternative versions of Poynting's theorem. Instead of the flux vector E × H as above, it is possible to follow the same style … See more
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