A 2.0 mm diameter wire of length 20 m has a resistance of 0.25 Ω. What is the resistivity of the wire?
A) 5.0 × 10-7 Ω ∙ m
B) 3.9 × 10-8 Ω ∙ m
C) 4.0 × 10-7 Ω ∙ m
D) 16 × 10-8 Ω ∙ m
E) 0.25 Ω ∙ m
Correct Answer:
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