CUET · PHYSICS · PYQ PAPER 2025
What will be the internal resistance of a cell of emf 2.2 V which gives a current of 0.2 A through a resistance of \( 10\Omega \) ?
- A \( 8.9 \, \Omega \)
- B \( 11.0 \, \Omega \)
- C \( 1.0 \, \Omega \)
- D \( 0.5 \, \Omega \)
Answer & Solution
Correct Answer
(C) \( 1.0 \, \Omega \)
Step-by-step Solution
Detailed explanation
\( I = \frac{E}{R + r} \) \( 0.2 \, \text{A} = \frac{2.2 \, \text{V}}{10 \, \Omega + r} \) \( r = \frac{2.2}{0.2} - 10 = 11 - 10 = 1.0 \, \Omega \)
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