A uniform metal wire of unknown composition has a length of 3.0 m and a mass of 7.0 g
PHYSICS · Single correct · CBSE · Physics · Current Electricity · Current Electricity
Problem
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) Brass
(b) Nichrome
(c) Copper
(d) Aluminum