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In Schering's bridge the two low-voltage arms are kept at a low potential and earthed at one point so that

  • A.the detector may be connected directly across the high voltage source without damage
  • B.the operator can adjust them in safety
  • C.the capacitance of the leads to earth is prevented from entering the balance equation
  • D.the high voltage is divided equally between the two arms of the measuring branch

Answer: B

The bulk of the applied voltage falls across the specimen and the standard capacitor, which are the two high-voltage arms. The adjustable arms carry only a few volts, so their controls can be handled and the detector connected without hazard. Guarding and earthing then complete the safety.

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