Using an electromagnetic flowmeter (Fig. P19.57), 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 ÎźV 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.
No comments:
Post a Comment