A uniform metallic wire is 0.60 m long and 1.20 mm in diameter
PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
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
(b) Constantan
(c) Nichrome
(d) Aluminum