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Homework Help: Can you help me with this problem?

  1. Apr 21, 2007 #1
    Electricity/Potential Difference

    1. The problem statement, all variables and given/known data
    A cylindrical copper cable carries a current of 1060 A. There is a potential difference of 1.6 x 10^-2 V between two points on the cable that are .26 m apart. What is the radius of the cable?

    2. Relevant equations

    R= V/I R= p(L/A) There may be more formulas needed.

    p of Copper is 1.72 x 10^-8

    3. The attempt at a solution
    I divided the given V by the given current to get the resistance, which came out to be 1.509 x 10^-5. I plugged that in to R= p(L/A) using 1.72 x 10^-8 for p, .26 for L, and (pi)(r^2) for A. I solved for r this way and got 9.712 x 10^-3 m. Is this right?
    Last edited: Apr 21, 2007
  2. jcsd
  3. Apr 22, 2007 #2


    User Avatar
    Science Advisor
    Homework Helper

    Yes. It's right. What could be wrong?
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