Question

Part A Patients undergoing an MRI occasionally report seeing flashes of light Some practitioners assume that this results from electric stimulation of the eye by the emf induced by the rapidly changing fields of an MRI solenoid. We can do a quick calculation to see if this is a reasonable assumption. The human eyeball has a diameter of approximately 25 mm Rapid changes in current in an MRI solenoid can produce rapid changes in field, with AB/At as large as 40 T/s What emf would this induce in a loop circling the eyeball? Express your answer with the appropriate units. For the steps and strategies involved in solving a similar problem, you may view a Video Tutor Solution Value Units Submit Reguest Answer Part B How does this compare to the 15 mV necessary to trigger an action potential? O This amount of omf is almost adequate to trigger an action potential This amount of emf is more than adequate to trigger an action potential This amount of emfis inadequate to trigger an action potential This amount of emf is absolutely inadequate to trigger an action potential

Answer 1

induced emf

e = (pi/4 d^2) dB/dt

e = 3.14/4* 0.025^2 * 40

e = 0.019625 V

b)

option (b) is correct

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