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If two adjacent arms of an alternating bridge are pure resistances, then to reach balance the remaining two arms must

  • A.have phase angles that are equal in magnitude but opposite in sign to one another
  • B.each be a pure reactance
  • C.be adjusted until their impedance magnitudes are equal
  • D.have equal phase angles

Answer: D

The two resistive arms contribute zero to each side of the angle equation, so the sum of the angles of the other two must be zero on each side taken separately, which for arms on opposite sides means their angles must be equal. Both must therefore be inductive or both capacitive.

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