(Solution) - Two copper wires have equal lengths but the diameter of -(2025 Original AI-Free Solution)

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Two copper wires have equal lengths, but the diameter of one is three times that of the other.
(a) The resistance of the thinner wire is (1) 3, (2) 1/3, (3) 9, (4) 1/9 times that of the resistance of the thicker wire.
(b) If the thicker wire has a resistance of 1.0-?, what is the resistance of the thinner wire?