Length of wire due to resistance

AI Thread Summary
To determine the length of a copper wire with a resistance of 1.00 ohm and a diameter of 0.462 mm, the resistance formula R = ρL/A is applied, where ρ is the resistivity of copper (1.7e-8 ohm-m). The user attempted to calculate the length using the formula but received an incorrect result. Clarifications were sought regarding the resistivity value for copper and the radius used in calculations. The discussion highlights the importance of accurate values and correct application of the formula in solving the problem.
Danny_b_2011
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Homework Statement



What length of copper wire, 0.462 mm in diameter, has a resistance of 1.00 (omega)?

Homework Equations



R=rho*L/A

The Attempt at a Solution



I tried it using this formula and the rho = 1.7e-8 but it didnt work and gave me the wrong answer can someone help?
 
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What answer did you get and how do you know it's wrong?
 
L = R*A/rho = 1*pi*r^2/(1.7e-8)

did you use this formula?
is rho = 1.7e-8 for copper?
did you use r=0.231e-3 [m]?
 

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