Question

Class 10PhysicsElectricity

Resistance of copper wire (L = 1m, A = 2mm², ρ = 1.7×10⁻⁸ Ω·m)

Verified Answer

R = ρL/A = (1.7×10⁻⁸ × 1) / (2×10⁻⁶) = 0.85×10⁻²

R = 8.5 × 10⁻³ Ω = 0.0085 Ω