28. Magnetic Fields and Forces
Magnets and Magnetic Fields
7:16 minutes
Problem 27.55
Textbook Question
Textbook Question(III) The Hall effect can be used to measure blood flow speed 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 speed in an artery 3.3 mm 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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