My name is Uppercase Q. Call me Big Q Big Q. I am q, too.

我叫大写Q。叫我大Q大Q。我也是q。

And you only need to know the value for big Q, the point charge.

你只需要知道大Q值， 不收取积分。

While both big Q and small q generate electric fields, we're going to assume that big Q has a much larger magnitude than small q.

大Q和小Q都诞生了 电场 我们将假设 Q 远大于 q。

And if you do, you'll see that the magnitude of the test charge cancels out and we're left with an expression that relies solely on big Q.

如果你这样做，你会看到测试费用的金额 没有，我们只剩下一个仅依赖于 Q 的语句。

The density of these field lines signifies the magnitude of the electric force on small q and the closer small q is to big Q, the greater the force.

场线的密度表示力 q 的大小 电，q 越接近 Q，力越强。

To study the effect that big Q has on other charges, we'll bring in a small positive test charge, small q, and measure the force that's acting on it.

为了研究 Q 对电荷的影响，我们引入了一个测试电荷 小正数 (q)。我们测量施加在它上面的力。