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

这等于电通量随时间变化乘以自由空间常数电常数。

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.

您可以们能量密度方程，并电场和电常数平方根时间替换磁场 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.

该方程简化了具有两个常数方程，电场自由空间电常数 epsilon 为零，磁场自由空间电常数 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.

如果你不提不会怪你，但自由空间电常数是们之前相对论常数，它将电荷与电场物理效应联系起来。

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.

在数学上，这个方程表明电通量是表面积上电场一个组成部分，它等于闭合电荷除以自由空间电常数。

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.

表示电容一种方法是将每个极板面积除以它们之间距离， 这乘以一个常数，称为可空间容差，由 epsilon 注释推断。