A potentiometer can compare the e.m.f.s of two cells using:

  1. mathcalE1mathcalE2 = l2l1
  2. mathcalE1mathcalE2 = l1l2
  3. mathcalE1 = l1 + l2
  4. mathcalE1mathcalE2 = l1l2
Answer

B) mathcalE1mathcalE2 = l1l2

Balance lengths ratio. SLO P-09-E-23 · Application

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