They then sent a current through it so that the coil was magnetised in a way which mimicked Earth's electromagnetic field.

然后他们将电流导入金属丝，这样金属丝就有了磁性，就像地球的电磁场一样。

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A coil of wire rotating in a magnetic field produces a current.

在一个线圈的电线旋转磁场产生电流。

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Ignition coil primary winding. Current flow through the coil produces an electromagnetic field, which is used to induce a high voltage in the secondary coil.

点火线圈初级绕组。电流通过线圈，产生一个电磁场，用来在次级线圈中产生高电压。

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That is we make animation file when you put the current to the coil of the field, getting established magnetic field.

即通过制作动画效果,当你将电流,输送到线圈上，形成磁场。

麻省理工公开课 - 媒体、教育、市场课程节选

For example, one of the experiments we do is measure the magnetic field of current coil, and after we do the experiment, we all have a passive visualization that shows the same experimental set-up, except we add to that.

比如，我们做的一个实验就是,测量电线圈的磁场，在我们做完实验之后，我们都感受到了一个直观化的过程,它展现了同样的实验过程，只是那是我们加的。

麻省理工公开课 - 媒体、教育、市场课程节选

The coil is suspended in an external magnetic field and the current running through it adjusted so that the attraction between the two magnets balances the gravitational force on the suspended mass.

ECONOMIST: Weighing a kilogram