PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
Two copper wires, A and B, are made of the same material. Wire B is twice as long as wire A and twice its radius. Which statement best compares their resistances?
(a) Wire B’s resistance is twice that of wire A.
(b) Wire B’s resistance is one-half that of wire A.
(c) Wire B’s resistance is four times that of wire A.
(d) Wire B’s resistance equals that of wire A.