Question

Chapter 22, Problem 04 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 0.46 m/s and the diameter of the vessel is 5.9 mm. In a 0.65-T magnetic field what is the magnitude of the voltage that is measured with the electrodes in the drawing? Electrode Blood - Electrode Number Units the tolerance is +/-2%

Answer 1

Use equation for motional EMF and the given values of speed and magnetic field to find the required magnitude of voltage as shown below

Dov -> v It's like a rod moving perpendicular to field. motional emf is, {= Bev { length I is equal to = (0.651)5.9x1043 m) 0-46m)s) 1.764 X10-3 v diameter here