CUET · PHYSICS · PYQ PAPER 2025
If the length of a wire is doubled while keeping its material and cross-sectional area same, the resistance of the wire
- A becomes double of its initial value
- B becomes half of its initial value
- C becomes four times of its initial value
- D remains same
Answer & Solution
Correct Answer
(A) becomes double of its initial value
Step-by-step Solution
Detailed explanation
\(R = \rho \frac{L}{A}\) \(R_{new} = \rho \frac{2L}{A} = 2 \left( \rho \frac{L}{A} \right) = 2R_{initial}\)
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