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)Both wires have the same resistivity.
B)The longer wire has 3 times the resistivity of the shorter wire.
C)The longer wire has 9 times times the resistivity of the shorter wire.
D)The longer wire has 27 times times the resistivity of the shorter wire.

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. Both wires, being made of copper, have the same resistivity regardless of their lengths.

Consider Two Copper Wires of Equal Cross-Sectional Area