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The Wheatstone bridge is balanced when

  • A.the four arms are all of the same resistance to within the tolerance of the standards
  • B.the products of opposite arms are equal
  • C.the sum of the resistances in the two ratio arms equals that of the remaining two arms
  • D.the current in the battery branch falls to zero and the supply is effectively unloaded

Answer: B

With arms P, Q, R and S taken in order round the bridge, balance requires PS equal to QR, so the unknown is obtained as the ratio P/Q multiplied by the known arm. The condition is independent of the supply voltage, which is the great merit of every null method.

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