NEET Physics Resistance & Resistivity MCQ Question
A wire of length 15 m and uniform cross-section 6.0 × 10^–7 m² has a resistance of 5.0 Ω. What is the resistivity of the material of the wire?
2.0 × 10^–7 Ωm
3.0 × 10^–7 Ωm
4.5 × 10^–7 Ωm
5.5 × 10^–7 Ωm
Correct Answer
Detailed Explanation
Using the formula for resistivity, ρ = (R * A) / L, where R is resistance (5.0 Ω), A is cross-sectional area (6.0 × 10^–7 m²), and L is length (15 m), we find ρ = (5.0 * 6.0 × 10^–7) / 15 = 2.0 × 10^–7 Ωm.
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