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 (see figure). In TMS, 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 stimulate neuronal activity. Treatment Coi Prefrontal (a) One such device generates an upward magnetic field within the brain that rises from zero to 1.50 Tin 115 ms. Determine the induced emf around a horizontal circle of tissue of radius 2.000 mm. magnitude 64 clockwise as seen from above direction (b) The field next changes to 0.500 T downward in 100.0 ms. How does the emf induced in this process compare with that in part (a)? 2.51E-4. magnitude Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. uv direction counterclockwise C as seen from above

Explanation / Answer

e = NA*dB/dt

dB = (-0.5 - 1.5) T

dt = 100 ms = 100 x 10^-3

in part change in magnetic field = 13 T/s in part b ) change in B = -20 T/s

so this 1.538 times

magnitude = 252 uN

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