試題詳解

2. A conducting wire has a 1.0 mm diameter, a 2.0 m length, and a 50 mΩ resistance. What is the resistivity of the material?
(A) 1.96×10⁻⁸Ω⋅m
(B) 9.8×10⁻⁷Ω⋅m
(C) 1.0×10⁻⁶Ω⋅m
(D) 3.5×10⁻⁵Ω⋅m
(E) 6.8×10⁻⁴Ω⋅m