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Balancing a bridge fitted with a Wagner earth requires

  • A.the supply to be reversed between the two adjustments so that the strays may cancel
  • B.two balances taken alternately until both hold
  • C.a single balance
  • D.the detector to be disconnected while the earthing branch alone is being adjusted

Answer: B

The detector is first switched to the earth point and the Wagner branch adjusted for a null, then switched back to the bridge and the arms adjusted. Each disturbs the other, so the two are worked alternately until both nulls hold at once.

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