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 1.8 T in 100 ms. Determine the magnitude of the induced emf within a circle of tissue of radius 1.8 mm and that is perpendicular to the direction of the field. e m f = ________mV

Explanation / Answer

B1 =0 , B2 =1.8 T , t =100 ms, r =1.8 mm

From fardays law induced emf = -d(phi)/dt = A(B1 -B2)/t

V = (3.14*1.8*1.8*10^-6*1.8)/(0.1)

V = 0.183 mV

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