Digging into the nanoworld
Nanotubes are made out of crystalline unit cells that repeat along a cylindrical structure. Unit cells have a polygonal shape, one of which is a hexagon.
Below is a circuit of four unit cells taken out from a nanotube. The resistance of each edge is the same. What is the ratio of the equivalent resistance between the top and the bottom point of this collection of unit cells to the resistance of a single edge?