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True or false: the balance of Maxwell's inductance bridge depends on the supply frequency.

  • A.False, the frequency cancels from the balance equation
  • B.True, because the reactance of the unknown coil rises with the frequency of the supply
  • C.True, since the standard inductor changes value as the frequency is altered
  • D.True, and the frequency must therefore be quoted with every result obtained from it

Answer: A

Inductance appears on both sides of the balance equation and the frequency factor cancels, so the result is free of it. That is a real convenience, since a mains-derived supply drifts. Bridges involving a capacitance against an inductance can also be arranged so that frequency cancels.

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