Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistivities of these two wires compare?
A) The longer wire has 27 times times the resistivity of the shorter wire.
B) The longer wire has 9 times times the resistivity of the shorter wire.
C) The longer wire has 3 times the resistivity of the shorter wire.
D) Both wires have the same resistivity.

Question

Quizplus · Accepted Answer

Resistivity is a material property and does not depend on the dimensions of the material, such as length or cross-sectional area. Therefore, both wires, being made of copper, have the same resistivity regardless of their lengths.

Consider Two Copper Wires of Equal Cross-Sectional Area