The resistance of a wire varies directly with its length and inversely with the square of its diameter. If 100 feet of wire with diameter 0.01 inch has a resistance of 60 ohms, what is the resistance of 81 feet of the same type of wire if its diameter is 0.09 inch?

Question

anonymous · Answer

R=(K*L)/D^2

Plug in the current values of R, L, and D to solve for the constant K.

Use this newly found constant to find the new resistance.