And that is equal to the change in electric flux over time, multiplied by the permittivity of free space constant.

这等于电通量随时的变化乘以自由空的电。

You can take our energy density equation and substitute the magnetic field magnitude, B, with the electric field, times the square root of the permittivity constants.

您可以使用我们的能量密度方程，并用电场和电的平方根时替换磁场的大小 B。

This equation simplifies down to an equation with two constants, the permittivity of free space for electric fields, epsilon naught, and the permittivity of free space for magnetic fields, mu naught.

该方程简化了具有的方程，电场的自由空电 epsilon 为零，磁场的自由空电 mu。

I won't blame you if you don't remember, but the permittivity of free space is a constant of proportionally we've used before, that relates electric charge to the physical effect of electric fields.

如果你不提我不会怪你，但自由空电是我们之前使用的相对论，它将电荷与电场的物理效应联系起来。

Mathematically, this equation says that electric flux is the integral of the electric field over the area of the surface, which is equal to the enclosed charge, divided by the permittivity of free space.

在学上，这方程表明电通量是表面积上电场的一组成部分，它等于闭合电荷除以自由空的电。

One way to express capacitance is to divide the area of each plate by the distance between them, and multiply that by a constant – known as the permittivity of free space – denoted by epsilon naught.

表示电容的一种方法是将每极板的面积除以它们之的距离， 这乘以一，称为可用空容差，由 epsilon 注释推断。