NEET Physics Resistance & Resistivity MCQ Question
A diagram shows a wire of length 15 m and uniform cross-section 6.0 × 10^–7 m^2 with a measured resistance of 5.0 Ω. Which of the following materials is most likely to have a resistivity matching this wire?
Copper with resistivity 1.68 × 10^-8 Ωm
Nichrome with resistivity 1.10 × 10^-6 Ωm
Silver with resistivity 1.59 × 10^-8 Ωm
Rubber with resistivity 10^13 Ωm
Correct Answer
Detailed Explanation
The resistivity of the wire can be calculated using the formula ρ = R * A / L. The given dimensions and resistance lead to a resistivity value typical for nichrome, which is higher than that of good conductors like copper or silver, but much lower than an insulator like rubber.
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