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# Help Appreciated

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How do I find the length of a copper wire, with diameter 0.420mm, conductivity of 5.80*10^8, conductance of 3.92

Jan 21, 2020

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If you had titled you question something relevant,   like  "Physics, conductivity of copper wire."

You would have been more likely to attract the attention of a physicist.

Jan 27, 2020
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Solution:

This is an elementary physics question. Use the formula below, relating the physical constants of the material property to the variable properties of a circuit conductor (wire).

$${}$$

$$\Large G=\sigma \frac {A}{l} \qquad|\qquad \small \text{Where G = conductance, σ =conductivity, A = cross-sectional area, and l = length of the conductor. }\\$$

$$\text {Rearrange to solve for (l).} \\$$

Note: In your post, you list the conductivity of the copper (wire) as 5.80E8. This value is more than nine (9) times higher than pure silver (wire) and almost 10 times higher than pure copper (wire).

GA

Jan 28, 2020