Given two wires (with circular cross-section) , one of copper having a length of 1.0 m and a diameter of 1.0 mm, the other of gold with a diameter of 2.0 mm, what length must the gold wire be in order to have the same resistance as the copper wire?
A) 1.4 m
B) 2.8 m
C) 4.2 m
D) 5.6 m
Correct Answer:
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