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Calculate the conductivity σ of the material of which this wire is made

  1. Feb 9, 2009 #1
    A wire is 1.0 m long and 1.1 mm2 in cross-sectional area. It carries a current of 5.4 A when a 2.1 V potential difference is applied between its ends. Calculate the conductivity σ of the material of which this wire is made.

    Known data: I hate Wileyplus.

    Ok, REAL known data: I know that I have to use 2pi(r), and pi(r)^2

    R= (roe)(L)/(A)


    I understand that if I were to use a specific material, I could find the resistance. However, this does not ask for that. Please help!
     
  2. jcsd
  3. Feb 9, 2009 #2

    LowlyPion

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    Homework Helper

    Welcome to PF.

    You know the resistance from V/I.

    You know the A.

    You know the Length.

    So what is σ?

    σ = 1/ρ
    and
    R = ρL/A
     
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