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 1.0 T in 100 ms. Determine the induced emf within a circle of tissue of radius 1.8 mm and that is perpendicular to the direction of the field.

Explanation / Answer

Area

A=pi*r^2 =pi*(1.8*10^-3)^2

A=1.018*10^-5 m^2

Induced emf

E=A(dB/dt) =(1.018*10^-5)(1/100*10^-3)

E=0.1018 mV

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