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.