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Two copper wires are labeled A and B. A is twice as long and has twice...

Two copper wires are labeled A and B. A is twice as long and has twice the diameter of B. Which of the following statements is true?

a) B has 4 times the resistance of A.

b) B and A have the same resistance.    

c) B has 1/2 the resistance of A.

d) B has twice the resistance of A.

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