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A capacitive transducer may sense displacement by varying

  • A.the resistance of the dielectric material between the plates
  • B.the spacing, the overlap area or the dielectric
  • C.the spacing alone, the other two quantities being fixed by construction
  • D.the frequency of the supply applied to the plates

Answer: B

All three quantities appear in the expression for capacitance, so any of them may carry the measurement. Varying the spacing gives a large but nonlinear response, varying the overlap area gives a linear one, and a moving dielectric slab suits level measurement.

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