Consider two copper wires. One has twice the length and twice the cross-sectional area of the other. How do the resistances of these two wires compare?

Question

Quizplus · Accepted Answer

The resistance of a wire is given by the formula R = ρ(L/A), where ρ is the resistivity, L is the length, and A is the cross-sectional area. If one wire has twice the length and twice the cross-sectional area, the resistance remains the same because the increase in length is exactly offset by the increase in area.

Consider Two Copper Wires