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4.  The drawing shows a type of flow meter that can be used
to measure the speed of blood in situations
when a blood vessel is sufficiently exposed (e.g., during surgery). Blood is
conductive enough that it can be treated as a moving
conductor. When it flows perpendicularly with respect to a magnetic field, as
in the drawing, electrodes can be used to measure
the small voltage that develops across the vessel. Suppose that the speed of
the blood is 0.30 m/s and the diameter of the vessel is 5.6 mm. In a 0.60-T
magnetic field what is the magnitude of the voltage that is
measured with the electrodes in the drawing?
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