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If two opposite arms of an alternating bridge are pure resistances, the other two arms must be such that

  • A.one is inductive and the other capacitive
  • B.both are inductive
  • C.both are capacitive
  • D.each contains resistance as well as reactance in the same proportion as the other

Answer: A

Here one resistive arm falls in each product, so the angle of the remaining arm in one product must equal minus the angle of the remaining arm in the other for the sum to balance. One arm must therefore lag and the other lead, which is why the Maxwell-Wien bridge measures inductance against a capacitance.

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