Electric flux equals the dot product of the electric field and the area, so let's  use that.

电通量等于电场与面积的点积，所以我们就使用它。

Well, You just gave us the equation for electric  flux.

好吧，你刚刚给了我们电通量方程。

Electric flux equals the integral of the dot product of electric field and dA.

电通量等于电场与dA的点积的积分。

Why couldn't a changing electric flux result in an induced magnetic field?

为什么我们不能改变导致感应磁场的电通量？

That is the equation for electric flux when  the electric field is uniform.

这就是电场均匀时的电通量方程。

Rather than using the dot product equation, let's use the electric flux equation  without the dot product.

我们不使用点积方程，而是使用不带点积的电通量方程。

And electric flux is a measure of the electric field that passes through a given area.

电通量是通过给定区域的电场的量度。

And we get an equation for electric flux which does not need the electric field to be  constant.

我们得到了一个不需要电场恒定的电通量方程。

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的变化乘以自由空间常数的介电常数。

So, the electric flux is independent of the  radius of the concentric spherical surface?

那么，电通量与同心球面半径无关吗？

Maxwell's second equation is also a form of Gauss's Law, only with magnetic flux instead of electric flux.

麦克斯韦第二方程也是高斯定律的一种形式，只是用磁通量代替了电通量。

Oh, that is why the net electric flux  through the right triangular box was zero.

哦，这就是为什么穿过直角三角盒的净电通量为零。

Actually, rather than using " fluxes" for  the plural of " flux" , I am going to say " electric flux values" .

实际上，我不会使用“通量”来表示“通量”的复数，而是说“电通量值”。

Maxwell's first equation is a form of Gauss's Law, which states that the electric flux through a closed surface is proportional to the total charge enclosed by that surface.

麦克斯韦第一个方程是高斯定律的一种形式，它指出通过封闭表面的电通量与封闭在该表面中的总电荷成正比。

We can substitute in the equation for the electric field  which surrounds a point charge and the equation for the surface area of a sphere into the electric  flux equation.

我们可以将点电荷周围的电场方程和球体表面积方程代入电通量方程。

I will also point out that, if the net charge  inside a closed Gaussian surface is zero, then the net electric flux through  the Gaussian surface is also zero.

我还要指出，如果封闭高斯曲面内的净电荷为零，则穿过高斯曲面的净电通量也为零。

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的球体的电通量等于正点电荷的电荷除以自由空间的介电常数。

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的一个组成部分，它等于闭合电荷除以自由空间的介电常数。

And, as long as the amount of  charge enclosed in a Gaussian surface is constant, the total electric flux through the  Gaussian surface does not depend on the size of the Gaussian surface.

并且，只要高斯表面所包裹的电荷量恒定，穿过高斯表面的总电通量就与高斯表面的大小无关。