And that  all still equals the charge inside the Gaussian surface divided by the permittivity of free space.

而这一切仍然等于高斯表面内电荷除以自由空介电数。

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

这等于电通量随时化乘以自由空数介电数。

We also know the Coulomb constant equals the  inverse of the quantity four pi times the permittivity of free space.

我们还知道库仑数等于四圆周率乘以自由空介电数倒数。

And that’s why the full equation for capacitance includes a dielectric constant, K. So dielectrics can help capacitors hold even more energy.

这就是完整电容方程包括介电数 K。因此电介质可以帮助电容器保持更多能量。

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.

您可以使用我们能量密度方程，并用电场和介电数平方根时替换磁场大小 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数方程，电场自由空介电数 epsilon 零，磁场自由空介电数 mu。

The electric flux which passes through a sphere which is  concentric to a positive point charge equals the charge of the positive point charge  divided by the permittivity of free space.

穿过与正点电荷同心球体电通量等于正点电荷电荷除以自由空介电数。

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，但自由空介电数是我们之前使用相对论数，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介电数。

And we get that the magnitude of the electric  field which surrounds and is caused by an infinitely large, thin plane of charges  equals surface charge density divided by the quantity two times permittivity of free space.

我们发现，由无限大而薄电荷平面包围并引起电场强度等于表面电荷密度除以自由空介电数两倍。