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 1.5 T in 100 ms. Determine the magnitude of the induced emf within a circle of tissue of radius 2.0 mm that is perpendicular to the direction of the field. Your response differs from the correct answer by more than 10%. Double check your calculations. mV

Explanation / Answer

step;1

Given that

magnetic field B=1.5 T

time t=100 ms

radius r=2 mm=2*10^-3 m

area A=3.14(2*10^-3)^2=12.56*10^-6 m^2

step;2

now we find the induced emf

the induced emf=BA/t=1.5*12.56*10^-6/100*10^-3

                       =1.884*10^-5 V

therefore the induced emf =1.884*10^-5 v

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