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Homework Help: Rank the resistances

  1. Oct 4, 2009 #1
    1. The problem statement, all variables and given/known data
    The figure below shows cross sections through three long square conductors of the same length and material, with square cross sections of edge lengths as shown. Conductor B fits snugly within conductor A, and conductor C fits snugly within conductor B.

    Rank the following according to their end-to-end resistances, greatest first: the individual conductors and the combinations of A + B (B inside A), B + C (C inside B), and A + B + C (B inside A inside C).

    http://img14.imageshack.us/img14/7955/phys2.jpg [Broken]

    2. Relevant equations

    R = p (L/A)

    3. The attempt at a solution
    Each of them have a different length and area, so I don't know how to go about this problem.
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Oct 4, 2009 #2


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    Science Advisor
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    Gold Member

    You have a relevant equation and the dimensions of your conductors. That's all you need.
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