What should be the diameter of an aluminum wire for its resistance to be equal to that of a copper wire which diameter is 2.17 mm? The two wires are of the same length. ρ (Copper) = 1.68 x 10-8 Ωm ρ (Aluminum) = 2.65 x 10-8 Ωm

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.