The resistance of a 100-cm wire of cross sectional area 2 × 10^-6m² is 400 Ω. What is the resistivity of the material of this wire? A) 0.8 × 10^-4 Ωm B) 8 × 10^-4 Ωm C) 0.8 × 10^-5 Ωm D) 0.8 × 10^-6 Ωm E) 8 × 10^-6 Ωm

Question

Quizplus · Accepted Answer

The resistivity (ρ) is calculated using the formula ρ = R * A / L, where R is resistance, A is cross-sectional area, and L is length. Here, R = 400 Ω, A = 2 × 10^-6 m², and L = 1 m (100 cm). So, ρ = 400 * 2 × 10^-6 / 1 = 8 × 10^-4 Ωm.

The Resistance of a 100-Cm Wire of Cross Sectional Area