The energy of electric field stored in the capacitor placed in an alternating electromagnatic field is concluded by using the principle of superposition and by starting with Maxwell equations.
本文运用叠加原理，从麦克斯韦方程的积分形式出发推导出在交变电磁场中储藏在电容器中的电场能量，并且指出了决定电容器电容数值的因素。
Secondly, the principle of finite element analysis of electromagnetic field is studied, Maxwell equations and differential equations are stated.
第二，本文研究了电磁场有限元分析原理，介绍了麦克斯韦方程和电磁场微分方程。
According to Faraday, Lenz and Maxwell theory, the basic principle and the directional method of transformers have been concretely studied.
根据法拉第、楞次、麦克斯韦理论，具体研究了变压器的基本原理和定向方法。
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