NEET Physics Resistance & Resistivity MCQ Question
A copper wire has a length of 10 m and cross-sectional area of 1.0 × 10^-6 m². If the resistivity of copper at a given temperature is 1.7 × 10^-8 Ωm, what is the resistance of the wire?
0.17 Ω
7 Ω
0.017 Ω
70 Ω
Correct Answer
Detailed Explanation
Resistance is calculated using the formula R = ρL/A. Substituting the given values: R = (1.7 × 10^-8 Ωm)(10 m) / (1.0 × 10^-6 m²) = 0.17 Ω.
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