The drawing shows a type of flow meter that can be used to measure the speed of
ID: 2259041 • Letter: T
Question
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 accross the vessel. Suppose the speed of the blood is 0.24 m/s and the diameter of the vessel is 5.6 mm. In a 0.67 T magnetic field what is the magnitude of the voltage that is measured with the electrodes in the drawing?
1 mV
THE ANSWER IS NOT 8.46E-4 mV
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 the speed of the blood is 0.24 m/s and the diameter of the vessel is 5.6 mm. In a 0.67 T magnetic field what is the magnitude of the voltage that is measured with the electrodes in the drawing?Explanation / Answer
voltage that is measured = B L V
where B- magnetic field, L distance between the electrodes , V velocity of fluid
here L = diameter of tube
voltage measured = BLV = 0.67 * 5.6* 10^(-3) *0.24 = 0.90048 millivolts.
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