Transcranial magnetic stimulation (TMS) is a noninvasive technique used to stimulate regions of the human brain. 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. (a) One such device generates an upward magnetic field within the brain that rises from zero to 1.50 T in 125 ms. Determine the induced emf around a horizontal circle of tissue of radius 1.70 mm. magnitude 109 µV (b) The field next changes to 0.500 T downward in 95.0 ms. How does the emf induced in this process co A long solenoid with 6.50 102 turns per meter and radius 2.00 cm carries an oscillating current I = 3.00 sin 90πt, where I is in amperes and t is in seconds. (a) What is the electric field induced at a radius r = 1.00 cm from the axis of the solenoid? (Use the following as necessary: t. Let E be measured in millivolts/meter and t be measured in seconds.) E=? any help.