Stretch a copper wire so that it is thinner and the resistance between its ends
A) remains unchanged.
B) decreases.
C) increases.

Question

Quizplus · Accepted Answer

When a copper wire is stretched, it becomes thinner and longer. This increases its resistance because resistance is directly proportional to the length of the conductor and inversely proportional to its cross-sectional area. As the wire gets thinner, its cross-sectional area decreases, leading to an increase in resistance.

Stretch a Copper Wire So That It Is Thinner and the Resistance