Two cells each of emf E and internal resistance r are connected in such a way that their positive terminals are connected to point X and negative terminals are connected to point Y. The potential difference between X and Y is
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → zero
Both cells have their positive terminals at X and their negative terminals at Y, so they are in parallel between X and Y. The potential difference between X and Y is the terminal voltage of this combination. With X and Y joined by a wire, the external resistance is zero, so the voltage across the terminals is zero.
\( \displaystyle V_{XY} = I R = I \times 0 = 0 \)
So the potential difference between X and Y is zero, which is Option (1).