A changing electric field produces a changing magnetic field, which produces a changing electric field, and so on.

变化的电场产生变化的磁场，磁场产生变化的电场，以此类推。

Fashion industry expert Veronika Lipar described the field's most important change – a move to sustainability.

时尚业专家韦罗妮卡·利帕尔描述了该领域最重要的变化——朝着可持续发展的方向发展。

Fashion industry expert Veronika Lipar described the field's most important change — a move to sustainability.

时尚业专家韦罗妮卡·利帕尔描述了该领域最重要的变化——朝着可持续发展的方向发展。

The sea changed, the fields changed, the rivers, the villages, and the people changed, yet Egdon remained.

沧海桑田，江河改道，世事兴衰，但埃格敦荒原未曾改变。

The dark spots as big as Earth are located near the most intense parts of the sun's changing magnetic field.

与地球一样大的暗斑位于太阳变化磁场最强烈的部分附近。

And when that field changes? That’s what induces an emf.

那个领域什么时候改变？这就是诱发电动势的原因。

Particles didn't have mass yet. And then the Higgs field changed.

粒子还没有质量。 然后希格斯场发生了变化。

However, there is a changing electric field, and it acts like a wireless current.

然而，有一个可变电场，它的行为就像无线电电流。

This change happens because the changing current in the first coil produces a changing magnetic field.

之所以会发生这种变化，是因为第一个线圈中不断变化的电流 会产生变化的磁场。

But as the direction of current switches, the direction of both the electric and magnetic fields change.

但随着电流方向的改变，磁场和电场的方向也随之改变。

And when that field changes? That's what induces an emf.

当该领域发生变化时？ 这就是产生电动势的原因。

But because the coil is rotating, the angle between the coil and the magnetic field changes.

但由于线圈在旋转， 线圈与磁场之间的角度发生了变化。

So now Faraday knew that when a magnetic field changed over time, it induced an emf in a loop of wire.

所以现在法拉第知道，当磁场随时间变化时，它会在线圈中感应出一个电动势。