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Mutual inductance between the arms of a bridge is troublesome because it

  • A.alters the effective impedance of the arms and falsifies the balance
  • B.raises the temperature of the coils and so alters the inductance being measured
  • C.prevents the detector from responding to the fundamental frequency of the supply
  • D.makes the balance depend on the amplitude as well as on the frequency of the source

Answer: A

Flux from one arm linking another adds an unaccounted term to the balance equation. The remedies are to space the coils well apart, to set them with their axes at right angles, and to screen them, which is one more reason capacitance standards are preferred to inductance standards.

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