AP EAMCET · PHYSICS · Current Electricity
The length and area of cross-section of a copper wire are respectively 30 m and \(6 \times 10^{-7} \mathrm{~m}^2\). If the resistivity of copper is \(1.7 \times 10^{-8} \Omega \mathrm{~m}\), then the resistance of the wire is
- A \(0.51 \Omega\)
- B \(0.68 \Omega\)
- C \(0.85 \Omega\)
- D \(0.75 \Omega\)
Answer & Solution
Correct Answer
(C) \(0.85 \Omega\)
Step-by-step Solution
Detailed explanation
\(R = \rho \frac{L}{A}\) \(R = (1.7 \times 10^{-8} \, \Omega \mathrm{~m}) \frac{30 \mathrm{~m}}{6 \times 10^{-7} \mathrm{~m}^2}\) \(R = 0.85 \, \Omega\)
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