A 20 Mm Diameter Wire of Length 20 M Has a a Resistance

Multiple Choice

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