Magnetic resonance imaging (MRI) is a medical technique

Chapter , Problem 20

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Magnetic resonance imaging (MRI) is a medical technique for producing pictures of the interior of the body. The patient is placed within a strong magnetic fi eld. One safety concern is what would happen to the positively and negatively charged particles in the body fl uids if an equipment failure caused the magnetic fi eld to be shut off suddenly. An induced emf could cause these particles to fl ow, producing an electric current within the body. Suppose the largest surface of the body through which fl ux passes has an area of 0.032 m2 and a normal that is parallel to a magnetic fi eld of 1.5 T. Determine the smallest time period during which the fi eld can be allowed to vanish if the magnitude of the average induced emf is to be kept less than 0.010 V.