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CUET · PHYSICS · PYQ PAPER 2025

The resistivity of the material of a wire of length 15 m, area of cross-section \( 6 \times 10^{-7} \text{ m}^2 \) and resistance 10 \(\Omega\) will be

  1. A \( 4 \times 10^{-7} \, \Omega\text{ m} \)
  2. B \( 2 \times 10^{-7} \, \Omega\text{ m} \)
  3. C \( 3 \times 10^{-7} \, \Omega\text{ m} \)
  4. D \( 5 \times 10^{-7} \, \Omega\text{ m} \)
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Answer & Solution

Correct Answer

(A) \( 4 \times 10^{-7} \, \Omega\text{ m} \)

Step-by-step Solution

Detailed explanation

\( \rho = \frac{R \cdot A}{L} \) \( \rho = \frac{10 \, \Omega \cdot 6 \times 10^{-7} \text{ m}^2}{15 \text{ m}} \) \( \rho = 4 \times 10^{-7} \, \Omega\text{ m} \)
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