A person wants to connect his stereo set to a remote speaker. If each wire must be 20 m long what diameter of copper wire should be used to keep the resistance less than 0.1 Ω?
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Specific resistance of copper = 1.7e-8 Ωm
A = ρL / R
πd²/ 4 = ρL / R = 1.7e-8*20 / 0.1
d =2.081e-3 m = 2.081 mm
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A = ρL / R
πd²/ 4 = ρL / R = 1.7e-8*20 / 0.1
d =2.081e-3 m = 2.081 mm
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