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according to the principle of faradayelectromagnetic induction, a large amount ofenergy is quickly discharged from large-capacitystorage capacitors to the coil. the coil is stimulated by strong current to produce pulse magnetic field, it can penetrate clothing, bones and other tissues generate inductive electric fields in stimulating parts, causing excitement/suppression activities of nerve cells ptms: based on a specific time interval and intensity, 2 stimuli is given to one specific area or two different parts, which are mostly used to study the easilvization and inhibitory effects of the nerves..syi