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A Hall effect sensor detects

  • A.Mechanical strain in a metal foil
  • B.The capacitance of a dielectric
  • C.A magnetic field
  • D.Temperature change in a semiconductor

Answer: C

As a speed pickup it responds to passing gear teeth or magnets without any mechanical contact, and it works down to zero speed. A variable reluctance pickup by contrast produces no output at all when the shaft is stationary.

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