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A standard capacitor is preferred to a standard inductor in precise bridge work because it

  • A.presents a purely resistive impedance at the frequencies at which such bridges work
  • B.does not need to be screened
  • C.has no external field and no eddy current loss
  • D.can be made variable over a much wider range than any coil of comparable accuracy

Answer: C

A capacitor's field is contained between its plates, so it neither couples to its surroundings nor suffers eddy current and hysteresis loss in nearby metal. An inductor radiates a field, picks up stray flux and changes value with what lies near it.

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