Resistance:

$\overline{){\mathbf{R}}{\mathbf{=}}{\mathbf{\rho}}\frac{\mathbf{l}}{\mathbf{A}}}$ where ρ is the resistivity, l is the length, and A is the cross-sectional area.

The copper wire and aluminium wire have the same length and must have the same resistance.

A circuit calls for a 0.900mm -diameter copper wire to be stretched between two points. You don't have any copper wire, but you do have aluminum wire in a wide variety of diameters. What diameter (in mm) aluminum wire will provide the same resistance?

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