Resistance per unit length:
Ra = ρal/π(da/2)2
Rc = ρcl/π(dc/2)2
Consider two wires, one aluminum with resistivity 2.65 × 10–8 Ω•m and one copper with 1.72 × 10–8 Ω•m. Find the ratio of the diameter of aluminum to copper wire, if they have the same resistance per unit length (as they might in household wiring).
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