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An engineer finds the measured capacitance of a parallel plate arrangement slightly larger than the simple formula predicts. The explanation is

  • A.the permittivity of the dielectric being lower than assumed
  • B.the separation being larger than the nominal value
  • C.the plates being of unequal area
  • D.fringing of the field at the edges of the plates

Answer: D

The field bulges outward beyond the edges, so more flux passes than the plane parallel picture allows and the capacitance is higher. The effect is small when the plates are large compared with their spacing, and guard rings are used when it must be eliminated for a precise measurement.

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