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 filed 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 1.5 T in 120 ms. Determine 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

Note that

emf = A(Bf - Bi) / t

As

Bf = 1.5 T
Bi = 0 T
A = pi r^2 = 8.04E-6 m^2
t = 120E-3 s

Thus,

emf = 1.0*10^-4 V or 0.10 mV [ANSWER]

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