Using an electromagnetic fl owmeter (Fig. P19.69), a heart

Chapter 19, Problem 19.102

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Using an electromagnetic fl owmeter (Fig. P19.69), a heart surgeon monitors the fl ow rate of blood through an artery. Electrodes A and B make contact with the outer surface of the blood vessel, which has interior diameter 3.00 mm. (a) For a magnetic fi eld magnitude of 0.040 0 T, a potential difference of 160 mV appears between the electrodes. Calculate the speed of the blood. (b) Verify that electrode A is positive, as shown. Does the sign of the emf depend on whether the mobile ions in the blood are predominantly positively or negatively charged? Explain.

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