A uniform metallic wire is 0.60 m long and 1.20 mm in diameter. Its resistance is 0.80 Ω at 20 °C and 0.82 Ω at 120 °C. Using the properties listed below, which material best matches BOTH measurements?
Material | Resistivity (Ω·m at 20 °C) | Temperature Coefficient α (°C⁻¹)
A. Copper 1.68 × 10⁻⁸ 3.9 × 10⁻³
B. Aluminum 2.82 × 10⁻⁸ 3.9 × 10⁻³
C. Nichrome 1.10 × 10⁻⁶ 1.7 × 10⁻⁴
D. Constantan 4.90 × 10⁻⁷ 5.0 × 10⁻⁵
a) Copper
b) Constantan
c) Nichrome
d) Aluminum