Question

Two wires of the same material and same length have radii 1 mm and 2 mm respectively. Compare their specific resistance.

Answer 1

`ρ_1 = ("R"_1 1/(pir_1^2))/l_1`

`ρ_2 = ("R"_2 1/(pir_2^2))/l_2` or

l₁ = l₂ and R₁ = R₂

∴ Ratio of resistivity = 1 : 1