1.An electrician wishes to cut a copper wire (ρ=1.724x10−8Ωm) that has no more than 10Ω of resistance. The wire has a radius of 0.725mm. Approximately what length of wire has a resistance equal to the maximum 10Ω?
2.What is the resistance of a 100m length of round copper wire with a radius of 0.3mm?
ρcopper=1.724x10−8Ωm
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