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JEE Physics · Medium

Current Electricity: Potentiometer Principle MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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Potentiometer PrincipleMediumQuestion 31631

Question

A potentiometer measures EMF of a cell without drawing current from it because at balance:
  1. A
    Galvanometer has zero resistance
  2. B
    No current flows through the unknown cell
    Correct
  3. C
    Bridge is unbalanced
  4. D
    Internal resistance is zero

Correct answer

No current flows through the unknown cell

Explanation

At null deflection (balance), no current flows through the unknown cell branch. Hence the EMF is measured truly without loading the cell.

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