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。
This method is different from usual method, we use the concept of electric flux and principle of superposition for the electric field.
与一般方法不同，本文利用电通量概念及电场叠加原理，推导出电场能量密度的普遍表达式。方法简明。
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