Transcranial magnetic stimulation (TMS) is a noninvasive technique used to stimu

Question

Transcranial magnetic stimulation (TMS) is a noninvasive technique used to stimulate regions of the human brain. A small coil is placed on the scalp, and a brief burst of current in the coil produces a rapidly changing magnetic field inside the brain. The induced emf can be sufficient to stimulate neuronal activity. One such device generates a magnetic field within the brain that rises from zero to 1.3 T in 100 ms. Determine the induced emf within a circle of tissue of radius 1.4 mm and that is perpendicular to the direction of the field. epsilon =

Explanation / Answer

Induced emf = -d?/dt

= BA/?t

= B?R

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