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。
2
Patients undergoing this treatment have a coil placed on their head which uses electromagnetic induction to activate weak electric currents via a changing magnetic field.
进行该项治疗的患者在头部置有一个线圈，这个线圈通过电磁感应在一个变化的磁场中激活弱电流。
3
As electricity moves through the power transmitter coil, it creates an electromagnetic field that sends a charge to the next coil.