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 the brief burst of current in the coil produces a rapidly changing mahnetic field inside the brain. The inducedemf can be sufficcient to stimulate neuronal activity, One such device generates a magnetic field within the brain that rises from zero to 1.7 T in 100 ms. Determine the magnitude of the induced emf within a circle of tissue of radius 1.6 mm and that is perpendicular to the direction of the field.

Explanation / Answer

dB/dt = 1.7/(100 x 0.001) = 17 T/s

A = 3.14 x (0.0016)2 = 8.04248 x 10-6 m2

emf = A(dB/dt) = 8.04248 x 10-6 x 17 = 1.36722 x 10-4 V

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