Question: The Hall effect can be used to measure blood flow rate because the blood contains ions that constitute an electric current. (a) Does the sign

The Hall effect can be used to measure blood flow rate because the blood contains ions that constitute an electric current.
(a) Does the sign of the ions influence the emf? Explain.
(b) Determine the flow velocity in an artery 3.3mm in diameter if the measured emf across the width of the artery is 0.13 mV and B is 0.070 T. (In actual practice, an alternating magnetic field is used.)

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