CUET · PHYSICS · PYQ PAPER 2025
The given graph shows the variation of terminal potential difference V, across the combination of three identical cells in series to an external resistor versus the current i in the circuit. The internal resistance of each cell is :
- A 0.5 \( \Omega \)
- B 1 \( \Omega \)
- C 1.5 \( \Omega \)
- D 0.75 \( \Omega \)
Answer & Solution
Correct Answer
(B) 1 \( \Omega \)
Step-by-step Solution
Detailed explanation
\(V=E-i r_{\text {total }}\) At \(V=0\) : \(0=6-2 r_{\text {total }}\) \(r_{\text {total }}=\frac{6}{2}=3 \Omega\) \(r_{\text {total }}=3 r\) \(3 r=3 \Rightarrow r=1 \Omega\)
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