A heart surgeon monitors the flow rate of blood through an artery using an electromagnetic flowmeter (see the figure below). 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 field magnitude of 0.0400 T, an emf of 118 µV 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.
This question was asked on Mar 16, 2010 and answered on Mar 17, 2010.
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