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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 52 T/s .

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 52 T/s .

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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 52 T/s. For the steps and strategies involved in solving a similar problem, you may view a Video Tutor Solution.
Transcribed Image Text: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 52 T/s. For the steps and strategies involved in solving a similar problem, you may view a Video Tutor Solution.
Part A What emf would this induce in a loop circling the eyeball? Express your answer with the appropriate units. HẢ E = Value Units Submit Request Answer Part B How does this compare to the 15 mV necessary to trigger an action potential? This amount of emf is more than adequate to trigger an action potential. This amount of emf is inadequate to trigger an action potential. This amount of emf is absolutely inadequate to trigger an action potential. This amount of emf is almost adequate to trigger an action potential.
Transcribed Image Text:Part A What emf would this induce in a loop circling the eyeball? Express your answer with the appropriate units. HẢ E = Value Units Submit Request Answer Part B How does this compare to the 15 mV necessary to trigger an action potential? This amount of emf is more than adequate to trigger an action potential. This amount of emf is inadequate to trigger an action potential. This amount of emf is absolutely inadequate to trigger an action potential. This amount of emf is almost adequate to trigger an action potential.
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