The driver cell of a potentiometer must have an e.m.f.:

  1. equal to zero
  2. less than the e.m.f. to be measured
  3. greater than the e.m.f. to be measured
  4. equal to the cell being measured
Answer

C) greater than the e.m.f. to be measured

Otherwise no balance point exists. SLO P-09-E-23 · Application

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