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## Homework Statement

Calculate the resistance per meter at room temperature of a constant wire if diameter [tex]1.25mm[/tex]. The resistivity of constant a at room temperature is [tex]5x10^-7\Omega{m}[/tex]

## Homework Equations

I'm not sure, but I think this is the right formula:

[tex]R = \frac{Pl}{A}[/tex]

## The Attempt at a Solution

[tex]Area = \pi \times \left(\frac{1.25 \times 10^{-3}}{2}\right)^2[/tex]

[tex]A = 1.2 \times 10^{-6} m^2[/tex]

What is Pl?