17. -12 points SerCP11 19.P.069 My Notes Ask Your Teacher Using an electromagnet

Question

17. -12 points SerCP11 19.P.069 My Notes Ask Your Teacher Using an electromagnetic flowmeter (see the figure below), 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 3.40 mm Artery To voltmeter Blood Electrodes Bflow (a) For a magnetic field magnitude of 0.0365 T, a potential difference of 160 / appears between the electrodes. Cac late the speed of the blood. m/s (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 answer has not been graded yet. Need Help? Read it

Explanation / Answer

a)

Magnetic force is balanced is force due to electric field

qvB =qE =q(V/d)

v=V/Bd =(160*10-6)/(0.0365*0.0034)

v=1.29 m/s

b)

No ,since sign of potential difference doesn't depend on whether the ions in the blood are positively or negatively charged.

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