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A capacitive transducer that varies the spacing between its plates has a characteristic that is

  • A.linear over the first half of its range and nonlinear thereafter
  • B.independent of the spacing, depending only on the area of overlap
  • C.nonlinear, capacitance varying inversely with spacing
  • D.linear, capacitance varying directly with the spacing of the plates

Answer: C

Capacitance is proportional to the reciprocal of the distance, so equal increments of displacement give unequal increments of capacitance. The sensitivity is very high at small spacings, which is why the arrangement is used for tiny displacements despite the curvature.

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