Consider two copper wires of equal cross-sectional area.One wire has 3 times the length of the other.How do the resistances of these two wires compare?
A)Both wires have the same resistance.
B)The longer wire has 1/3 the resistance of the shorter wire.
C)The longer wire has 3 times the resistance of the shorter wire.
D)The longer wire has 9 times times the resistance of the shorter wire.
E)The longer wire has 27 times times the resistance of the shorter wire.

Question

Quizplus · Accepted Answer

The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. Therefore, if one wire has three times the length of the other wire and the same cross-sectional area, then it will have three times the resistance.

Consider Two Copper Wires of Equal Cross-Sectional Area