Actually, you already know enough to "solve" #10. Which is to say, it is a trick question. Electrical Resistance relates to how resistant a material is to an electrical current. A current must have physical space to travers. No material can exist at 2-Dimensions, therefore there is no material for the current to travel through (indeed, there isn't even room for the current itself to exist). The resistance is then nonexistant, or effectively the answer is "infinitely resistant." No electicity will ever travel between two nodes along a 2-dimensional plane... I think.