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Homework Help: Finding Length and Diameter Of A Wire

  1. Mar 14, 2013 #1
    1. The problem statement, all variables and given/known data
    Suppose you wish to fabricate a uniform wire from 2.00 g of copper. The wire is to have a resistance of* R = 0.480 Ω*and all the copper is to be used.

    2. Relevant equations

    3. The attempt at a solution

    In the problem, they suggest using this relationship for resistance [itex]R=\rho A l[/itex]. How did they get that? From my understanding, resistance is [itex]R = \rho \frac{l}{A}[/itex]
  2. jcsd
  3. Mar 14, 2013 #2


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    Homework Helper

    You are right, R=ρL/A.

  4. Mar 14, 2013 #3
    The mass is [itex]M=Ald[/itex], where d is the density.
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