Chapter 21, Problem 19P

BIO Stimulating the brain in transcranial magnetic stimulation (TMS) an abrupt decrease in the electric current in a small coil placed on the scalp produces an abrupt decrease in the magnetic field inside the brain Suppose the magnitude of the $\stackrel{\to }{B}$ field changes from 0.80 T to 0 T in 0.080 s. Determine the induced emf around a small circle of brain tissue of radius $\text{1}\text{.2 }\times \text{ 10 m}$. The $\stackrel{\to }{B}$ field is perpendicular to the surface area of the circle of brain tissue