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。
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.
电荷是电流对时间的积分，(公式)电荷常常用一个表面上的带电粒子数，或一个元件(如电容器)上的粒子数来度量。
Charge is the time integral of current,. Charge is often measured on a quantity of particles, on a surface, or on a component such as a capacitor.
通过求解微分方程，得到圆形平行板电容器间匀变电场激发的感生磁场，所得结果与积分法完全相同。
The magnetic field induced by the even varying electric field is calculated by solving differential equations, and the result is identical to that from integral.
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