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Homework Help: Calculate the resistance per meter

  1. May 9, 2008 #1
    1. The problem statement, all variables and given/known data

    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]

    2. Relevant equations

    I'm not sure, but I think this is the right formula:
    [tex]R = \frac{Pl}{A}[/tex]

    3. 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?
  2. jcsd
  3. May 9, 2008 #2
    P is the resistivity and L is the length of the wire, so you are really solving for R/L
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