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

The resistance of a copper wire 200 m long is 21 ω. If its thickness

1.	The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around
A.	.2 x 10-8 ω-m
B.	.4 x 10-8 ω-m
C.	.6 x 10-8 ω-m
D.	.8 x 10-8 ω-m
Answer» D. .8 x 10-8 ω-m