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。
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.
当待加工部件在设备里就位后，线圈在其中产生感应磁场。
When the component to be worked is placed next to such a machine, the coil induces in it a corresponding field.
利用滑块带动金属杆切割亥姆霍兹线圈中心区域匀强磁场的磁感应线，可以产生感应电动势。
Using the slider to drive a metal bar to cut perpendicularly the uniform magnetic field in the center of a Helmholtz coil, induction electromotive force could be produced.
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