The Hall effect can be used to measure blood flow rate because the blood contain

Question

The Hall effect can be used to measure blood flow rate because the blood contains ions that constitute an electric current.

Part A
Does the sign of the ions influence the emf?
a) Yes, it affects the magnitude and the polarity of the emf.
b) Yes, it affects the magnitude of the emf, but keeps the polarity.
c) Yes, it affects the polarity of the emf, but keeps the magnitude.
d) No, the sign of ions don't influence the emf.

Part B
Determine the flow velocity in an artery 3.4 in diameter if the measured emf is 0.15 and is 7.1×10-2 . (In actual practice, an alternating magnetic field is used.)

Explanation / Answer

Hall voltage related to magnetic field and the chage  is V = IB/ned                        A) Yes, it affects the polarity of the emf, but keeps the magnitude.   

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