Rank Resistances: A, B, C, A+B, B+C, A+B+C

[Firecloak]

Homework Statement

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

Homework Equations

R = p (L/A)

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.

 

[kuruman]

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