A rod (length = 80 cm) with a rectangular cross section (1.5 mm * 2.0 mm) has a resistance of 0.20 Ω. What is the resistivity of the material used to make the rod?

The resistivity of the material used to make the rod is ρ = 7.5 * 10⁻⁷ Ω. m

Explanation:

R = 0.2 Ω

L = 0.8 m

S = 1.5mm*2mm = 3 mm² = 3 * 10⁻⁶ m²

ρ = (R*S) / L

ρ = 7.5 * 10⁻⁷ Ω. m