What happens to the resistance of a metal wire when it is made longer, with the same thickness and material?
Answer and explanation
Correct answer: C. It increases
- Step 1: The resistance of a wire is proportional to its length, so a longer wire has a greater resistance. Answer: It increases. Why not the others: Resistance decreases when a wire is made thicker or shorter, not longer; it would stay the same only if the length did not change; and it falls to zero only in a superconductor.
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