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Homework Help: Resistivity of a wire.

  1. Jun 21, 2011 #1
    1. The problem statement, all variables and given/known data
    A wire has a diameter of 1.51 mm and a length of 32.7 m, and is found to have a resistance of 1.5 capital omega. What is the resistivity of the wire?



    2. Relevant equations



    3. The attempt at a solution
    R=qL/A
    R=.0051/2=7.55E-4
    L=32.7
    A = ?
    How do i find A to plug into the equation to find q?
     
  2. jcsd
  3. Jun 21, 2011 #2

    rl.bhat

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    Homework Helper

    In the formula R = resistance of the wire, A, the area of the cross section of the wire = π*r^2, where r is the radius of the wire = diameter/2.
     
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