NEET Physics Resistance & Resistivity MCQ Question
A copper wire of length 2 m and cross-sectional area 1 × 10^-6 m² has a resistance of 0.5 Ω at 20°C. What is the resistivity of copper at this temperature?
5 × 10^-8 Ωm
0 × 10^-7 Ωm
5.0 × 10^-8 Ωm
5 × 10^-7 Ωm
Correct Answer
Detailed Explanation
The resistivity ρ is calculated using the formula ρ = R * A / L. Substituting the given values, ρ = (0.5 Ω) * (1 × 10^-6 m²) / (2 m) = 2.5 × 10^-8 Ωm.
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