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Balance of an alternating current bridge requires that

  • A.two conditions be satisfied simultaneously
  • B.the products of the impedances of the opposite arms be numerically equal in magnitude
  • C.the phase angles of all four arms of the network be equal to one another
  • D.the detector be replaced by one whose impedance matches that of the bridge output

Answer: A

The balance equation is an equality between two complex products, and a complex equation is two real equations. One fixes the magnitudes and the other the phase angles, so an alternating bridge always needs two independent adjustments worked alternately until the detector falls silent.

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