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The simple form of De Sauty's bridge can be balanced properly only if both capacitors are

  • A.arranged with a resistance in series to allow the phase balance to be adjusted
  • B.considerably smaller than the stray capacitance of the bridge network itself
  • C.loss free
  • D.of the same nominal value to within a few per cent of one another

Answer: C

A real capacitor has loss, which gives it a phase angle short of ninety degrees. If the two capacitors differ in loss, the angle condition cannot be met and the detector never falls fully silent. The modified bridge adds a resistance in series with each capacitor to cure exactly this.

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