So the two parallel wires attracted and repelled each other because of the magnetic field created by the current.

由于电流产生的磁场，即使是两条平行的导线也相互吸引和排斥。

So first, those two parallel wires: why do they attract and repel each other?

那么首先，这两条平行线：为什么它们相互吸引和排斥？

We also talked about the forces between two parallel wires, and the magnetic field created by a solenoid.

我们还讨论了两条平行线之间的力，以及螺线管产生的磁场。

He took two parallel wires, ran a current through both of them in the same direction, and the wires attracted each other!

他拿了两根平行的线，把它们都转向同一个方向，线就互相吸引了！

But the equation he came up with, the one that we now call Ampere's Law, allowed him – and future physicists! – to figure out what B was in a lot of situations, including the case of the two parallel wires.

但是他提出的方程式，我们现在称之为安培定律的方程式，允许他 - 以及未来的物理学！ - 看看B在很多情况下是什么，包括两条平行线的情况。