Answered: Artery +|A To voltmeter N S Blood flow…

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter21: Circuits And Dc Instruments

Section: Chapter Questions

Problem 22CQ: Apply the loop rule to loop afedcba in Figure 21.47.

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Question

Using an electromagnetic flowmeter (Fig. P19.69), a
heart surgeon monitors the flow 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 field magnitude of 0.040 0 T, a potential
difference of 160 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.

Artery
+|A
To voltmeter
N S
Blood
flow
Electrodes
Figure P19.69

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