电磁能量平衡方程和波印廷定理

arXiv: Classical Physics Pub Date : 2019-10-06 DOI:10.36227/TECHRXIV.12555698.V1

G. Xiao

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引用次数: 3

摘要

波印廷定理在分析电磁现象中起着非常重要的作用。电磁功率磁通密度通常用坡印亭矢量表示。然而，由于Poynting定理主要关注的是系统中的功率平衡，因此在某些情况下，用它来评估电磁能并不那么方便。本文重新讨论了时变电场的能量平衡问题，引入了一套能量平衡方程，并提出了一种修正的功率通量计算方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Electromagnetic Energy Balance Equations and Poynting Theorem

Poynting theorem plays a very important role in analyzing electromagnetic phenomena. The electromagnetic power flux density is usually expressed with the Poynting vector. However, since Poynting theorem basically focuses on the power balance in a system, it is not so convenient in some situations to use it for evaluating the electromagnetic energies. The energy balance issue for time varying fields is revisited in this paper, and a set of energy balance equations are introduced, and a modified method for evaluating power flux is proposed.

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来源期刊

arXiv: Classical Physics

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