Using an electromagnetic flowmeter (Fig.P19.69), a heart
Chapter , Problem 69(choose chapter or problem)
Using an electromagnetic flowmeter (Fig.P19.69), a heart surgeon monitors the flow rate ofblood through an artery. Electrodes A and B make contactwith the outer surface of the blood vessel, whichhas interior diameter 3.00 mm. (a) For a magneticfield magnitude of 0.040 0 T, a potential differenceof 160 mV appears between the electrodes. Calculatethe speed of the blood. (b) Verify that electrode A ispositive, as shown. Does the sign of the emf dependon whether the mobile ions in the blood are predominantlypositively or negatively charged? Explain.
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