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

这等于电通随的变化乘以自由空常数的电常数。

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.

您可以使用我们的能方程，并用电场和电常数的平方根换磁场的大小 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.

该方程简化了具有两个常数的方程，电场的自由空电常数 epsilon 为零，磁场的自由空电常数 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.

如果你不提我不会怪你，但自由空电常数是我们之前使用的相对论常数，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.

在数学上，这个方程表明电通是表面积上电场的一个组成部分，它等于闭合电荷除以自由空的电常数。

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.

表示电容的一种方法是将每个极板的面积除以它们之的距离， 这乘以一个常数，称为可用空容差，由 epsilon 注释推断。