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 1.2 T in 100 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.
= 9.6x10^-5


Your response is off by a multiple of ten. mV

WHY?!

Explanation / Answer

The formula for induced EMF is

= BA/t      A = r2   = ()(2 X 10-3)2 = 1.257 X 10-5 m2

= (1.1)(1.257 X 10-5)/(100 X 10-3)

= 1.38 X 10-4 V which is .138 mV

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