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A hear surgeon monitors the flow rate of blood through an artery using an electr

ID: 1668883 • Letter: A

Question

A hear surgeon monitors the flow rate of blood through an artery using an electromagnetic flow meter (Fig. 2) in which electrodes A and B attached to the outer surface of a blood vessel of inside diameter 3.0 mm. (a) [10] For a magnetic field strength of 0.040 T, an emf of 160 V is developed. Calculate the speed of the blood flow. (b) [5] Verify t electrode A is positive, as shown. [5] Does the sign of the emf depend on whether the ions in the blood are positive or negatively charged? Explain. Figure 2

Explanation / Answer

Magnetic field B = 0.04 T

Emf V = 160 V

Diameter d = 3 mm = 3 * 10 ^ -3 m

Electric field E = V / d

                         = 53333.333 V/ m

Speed of blood v = E / B

                             = 1.3333* 10 ^ 6 m / s

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