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Question 31687
JEE Physics · Hard

Current Electricity: Potentiometer Accuracy MCQ

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Potentiometer AccuracyHardQuestion 31687

Question

In a potentiometer experiment, if the driver cell's EMF decreases slightly, the balance point for an unknown EMF:
  1. A
    Moves towards the battery end
  2. B
    Moves away from the battery end
    Correct
  3. C
    Stays same
  4. D
    Shifts to 50 cm

Correct answer

Moves away from the battery end

Explanation

Lower driver EMF → lower potential gradient. A longer wire length l is now needed to balance the same unknown EMF (E = φl). Balance shifts further from the battery.

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