The resistance of a copper wire 200 m long is 21 Q. If its thickness ( – McqOptions

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1.	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.	1.2 x 10~8 Q-m
B.	1.4 x 10~8 Q-m
C.	1.6 x 10""8 Q-m (d)
D.	1.8 x 10"8 Q-m
Answer» D. 1.8 x 10"8 Q-m

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