As the magnetic fields interact, they can induce very strong currents of electricity in the Earth's crust.

当磁场相互作用时，它们会在地壳中产生很强的电流。

We've known since the middle of the 19th century about geomagnetically induced currents.

- 我们从 19 世纪中叶就知道地磁感应电流。

As the loop rotates, the changing magnetic flux induces a current in the loops of the coil.

当环旋转时，变化的 磁通量会在线圈的环中感应出电流。

Could magnetic fields create – or induce – an electric current?

磁场会产生或 感应出电流吗？

The other waste goes past a type of magnet called an eddy current, which induces a current in non-magnetic metals.

另一种废物通过一种称为涡流的磁铁， 它会在非磁性金属中感应出电流。

This therefore creates a change in magnetic flux and induces a current in the loop.

因此，这会产生 磁通量变化并在回路中感应出电流。

But in what direction will the induced current flow?

但是感应电流会流向什么方向 呢？

It turns out that magnetic fields do induce electric currents.

事实证明，磁场确实会 产生电流。

So the magnetic field created by the induced current will point upward to counteract this change.

因此，感应电流产生的磁场将向上指向以抵消这种变化。

When Faraday discovered that magnetic fields induce electric currents, he got kind of lucky.

当法拉第发现磁场 感应电流时，他有点幸运。

A CME's energy can induce currents in our power grid that can either completely shut it down or worse, destroy the transformer stations that keep our grid running.

一场CME的能量足以诱导可以完全阻断我们电网的电流，更糟糕的话，损毁使电网持续运行的变压器。

Well, Lenz’s law says that the magnetic field generated by the induced current will be in the direction opposite the change magnetic flux.

嗯，楞次定律说，感应电流产生的磁场将与变化的磁通量的方向相反。

It interacts with the existing electric field, which induces a weak electric current that travels through your finger and eventually back into the phone.

它与现有的电场相互作用，产生微弱的电流， 穿过你的手指，最终返回手机。

And according to Lenz's law, the magnetic field created by the induced current will oppose this – so it'll point downward.

根据楞次定律，感应电流产生的磁场会与此相反——所以它会指向下方。

L is a constant, known as the inductance, signifying how well that specific coil induces an opposing current, depending on its shape and size.

L。L 是一个常数，称为电感，表示特定线圈感应反向电流的程度，具体取决于其形状和大小 。

Using a magnetic field to induce a current is useful for all kinds of reasons – we’ll talk about some of the main ones next time.

出于各种原因，使用磁场感应电流都很有用——我们下次将讨论一些主要的原因。

And once you know the direction of the magnetic field generated by the induced current, you can figure out the direction of the current from there.

一旦知道了感应电流产生的磁场方向，就可以从那里算出电流的方向。

Make a " stop" sign with your right hand, then point your thumb in the direction of the magnetic field being generated by the induced current.

用右手做一个“停止”标志，然后将拇指指向感应电流产生的磁场方向。

But the angle that the coil makes with respect to the magnetic field keeps changing, which causes the direction of the induced current to reverse itself at every half-turn.

但是线圈相对于磁场的角度不断变化，这导致感应电流的方向每半圈就会反转。

That is, until two physicists, Joseph Henry and Michael Faraday, both on their own, figured out what was happening: It turns out that magnetic fields do induce electric currents.

也就是说，直到两位物理学家约瑟夫·亨利和迈克尔·法拉第独自弄清楚发生了什么：事实证明磁场确实会感应电流。