CUET · PHYSICS · PYQ PAPER 2025
A wire of \( R_{original} = 10 \Omega \) resistance is stretched to thrice its original length. Its new resistance \( R_{new} \) would be
- A \( 10 \Omega \)
- B \( 3 \Omega \)
- C \( 90 \Omega \)
- D \( 30 \Omega \)
Answer & Solution
Correct Answer
(C) \( 90 \Omega \)
Step-by-step Solution
Detailed explanation
\( R_{new} = n^2 R_{original} \) \( R_{new} = (3)^2 \times 10 \, \Omega = 9 \times 10 \, \Omega = 90 \, \Omega \)
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