Resistance and Resistivity: 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.
Answer: C
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