Which of the following statements is true about electromotive force (emf) of a cell?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → emf is the potential difference between positive and negative terminals of a cell in a open circuit.
Explanation: EMF is the maximum potential difference a cell can provide when no current is drawn (open circuit). It does not depend on the external resistance. The potential difference in a closed circuit may be less than the emf due to internal resistance of the cell.
emf is the potential difference between positive and negative terminals of a cell in an open circuit.