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A piezoelectric transducer produces

  • A.an inductance change proportional to the displacement of a core
  • B.a charge proportional to the applied force
  • C.a resistance change proportional to the applied force
  • D.a current proportional to the rate of change of temperature

Answer: B

Deforming certain crystals separates charge across their faces in proportion to the deformation, and hence to the force producing it. Quartz and various ceramics are used, and the same effect run backwards makes such a crystal a source of ultrasound.

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