Answer to Question #343309 in Electric Circuits for Deng

Question #343309

 The resistance of a uniform copper wire 50.0 meters long and 1.15 mm in

diameter is 0.830 ohms at

20° C. What is the resistivity of the copper at this temperature?


1
Expert's answer
2022-05-20T13:19:35-0400
"R=\\rho\\frac{l}{A}"

"\\rho=RA\/l=R\\pi(d\/2)^2\/l\\\\\n=0.830*3.14*(0.0015\/2)^2\/50.0=2.93*10^{-8}\\:\\rm \\Omega\\cdot m"


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