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A guard ring is used in a precision capacitance measurement to

  • A.provide a second electrode for a differential measurement
  • B.confine the field to a defined area and remove fringing
  • C.increase the capacitance by adding to the plate area
  • D.screen the arrangement from external magnetic fields

Answer: B

A ring surrounding the measuring electrode, held at the same potential but connected separately, carries away the fringing flux and leaves the field between the main electrodes truly uniform. The capacitance then agrees with the simple formula to a high accuracy, which is what a standard capacitor requires.

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