NEET Physics Resistance & Resistivity MCQ Question
Which of the following statements about the electromotive force (emf) and internal resistance in a circuit are correct?
The emf of a cell is a measure of potential difference and is always positive.
Internal resistance of a cell does not affect the current flowing in the circuit.
The emf is a force that drives the current through a circuit.
The equivalent emf in a parallel combination of cells can be calculated using the formula ε_eq = ε_1 + ε_2 + ... + ε_n.
Correct Answer
Detailed Explanation
The correct statement is that the emf of a cell is indeed a measure of potential difference and is always positive. Statement B is incorrect because internal resistance affects current, while C misrepresents emf as a force rather than a potential difference. Statement D is incorrect for parallel combinations, as the correct formula involves the internal resistances as well.
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