CUET Preparation Today
Which of the following statements is true about electromotive force (emf) of a cell? |
It depends on external resistance. emf is the potential difference between positive and negative terminals of a cell in a closed circuit. It has electrostatic origin. emf is the potential difference between positive and negative terminals of a cell in a open circuit. |
emf is the potential difference between positive and negative terminals of a cell in a open circuit. |
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. |
