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Integra-differential equation of Leontovich-Levin played a great role in the development of a theory of thin linear antennas. It is characterized by strict formulation of a problem and by possibilities of evolution of its solution procedure [1]. Analysis of the results obtained by using this equation allows us to clarify separate questions of the antenna theory.
The article tells about the contribution of Vainstein's theorem in the development of electromagnetic theory. In accordance with this theorem the total power of electromagnetic field consists of active and oscillating components. The first magnitude is the active part of the power flow, equal to its average value. The second magnitude is the oscillating part of the power flow. It oscillates in time...
The article tells about the contribution of Vainstein's theorem in the development of electromagnetic theory. In accordance with this theorem the total power of electromagnetic field consists of active and oscillating components. An example of a problem, which is solved by means of this theorem, — resistance of losses in an earth and grounding — is considered in the paper.
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