Question: 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

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-Ω, what is the resistance of the thinner wire?

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