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Screening the arms and leads of a precision alternating bridge serves to

  • A.keep the temperature of the arms uniform so that their values do not drift during a test
  • B.eliminate the mutual inductance between the source transformer and the detector
  • C.make the stray capacitances definite and constant
  • D.prevent the measuring current from leaking away to earth through the insulation

Answer: C

Stray capacitance cannot be abolished, but earthed screens fix it at a value that does not change when the operator moves a hand near the apparatus. Once definite, it can be balanced out or calculated, whereas a wandering stray defeats any precision.

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