A safety concern for a patient in an MRI machine is that if the magnetic field w

Question

A safety concern for a patient in an MRI machine is that if the magnetic field were suddenly shut off, an induced emf could cause charged particles in body fluids to flow, producing an electric current within the body the largest surface of the body through which flux passes has an area of 0.033 m^2 and a normal that is parallel to a magnetic field of 1.6T. Determine the smallest time period during which the field can be allowed to vanish if the magnitude of the average induced emf is to be kept less than 0.0095V. Show your work.

Explanation / Answer

induced emf e = A dB/dt

dt = 0.033* 1.6/0.0095

dt = 5.557 secs

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