CUET · PHYSICS · PYQ PAPER 2023
The resistance of a wire is \(10 \Omega\). Its length is increased by \(10 \backslash \%\) by stretching. The new resistance of the wire will now be :
- A \(12.1 \Omega\)
- B \(21.2 \Omega\)
- C \(121 \Omega\)
- D \(11 \Omega\)
Answer & Solution
Correct Answer
(A) \(12.1 \Omega\)
Step-by-step Solution
Detailed explanation
\(L_2 = 1.1 L_1\) \(R_2 = (\frac{L_2}{L_1})^2 R_1 = (1.1)^2 \times 10 \, \Omega\) \(R_2 = 12.1 \, \Omega\)
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