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A 2 m long gauge 14 copper wire (diameter 1.624 mm, resistivity 1.72 × 10-8 Ωm)...

A 2 m long gauge 14 copper wire (diameter 1.624 mm, resistivity 1.72 × 10-8 Ωm) replaces a similar 2 m long copper wire but of gauge 20 (diameter 0.812 mm). The resistance of the new wire is then that of the original wire.

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