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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
20
Magnetism
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20-3: Force on Electric Current in Magnetic Field
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20-4: Force on Charge Moving in Magnetic Field
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20-5 and 20-6: Magnetic Field of Straight Wire, Force between Two Wires
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20-7: Solenoids and Electromagnets
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20-8: Ampère's Law
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20-9 and 20-10: Torque on Curent Loop, Motors, Galvanometers
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20-11: Mass Spectrometer
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20-12: Ferromagnetism, Hysteresis
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 23
Q

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

  1. Does the sign of the ions influence the emf? Explain.
  2. Determine the flow velocity in an artery 3.3 mm in diameter if the measured emf across the width of the artery is 0.13 mV and BB is 0.070 T. (In actual practice, an alternating magnetic field is used.)
A
  1. The sign of the ion determines the polarity of the Hall EMF
  2. 0.6 m/s0.6 \textrm{ m/s}
Giancoli 7th Edition, Chapter 20, Problem 23 solution video poster
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