The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around_______________?

A. 1.8 x 10?8 Q-m

B. 1.6 x 10?8 Q-m

C. 1.4 x 10~8 Q-m

D. 1.2 x 10~8 Q-m

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