Question

Resistance of metal wire of length 1m of 26 ohm diameter is 0.3 mm find resustivity

Answer 1

R = ρL / A

ρ = RA / L
= Rπr^2 / L
= (26 × π × (0.3/2 × 10^-3)^2) / 1
= 1.838 × 10^-6 Ω m

Resistivity of material of the wire is 1.838 × 10^-6 Ω m