A uniform metal wire of unknown composition has a length of 3.0 m and a mass of 7.0 g. Its electrical resistance at 20 °C is 0.22 Ω. The density and resistivity of four candidate materials are given below. Which material is MOST likely the wire’s composition?
Material | Density (kg·m⁻³) | Resistivity (Ω·m at 20 °C)
A. Copper 8.9 × 10³ 1.68 × 10⁻⁸
B. Aluminum 2.7 × 10³ 2.82 × 10⁻⁸
C. Brass 8.5 × 10³ 6.0 × 10⁻⁸
D. Nichrome 8.4 × 10³ 1.10 × 10⁻⁶
a) Brass
b) Nichrome
c) Copper
d) Aluminum