Two uniform wires A and B are made of different materials but have the same length
PHYSICS · Multi-part · CBSE · Physics · Current Electricity · Current Electricity
Problem
Two uniform wires A and B are made of different materials but have the same length. Their respective resistivities are ρA and ρB, and their resistances are equal.
(i) Show that the ratio of their cross-sectional areas is ABAA=ρBρA.
(ii) Wire A is of nichrome with resistivity 1.1×10−6Ωm, while wire B is of copper with resistivity 1.7×10−8Ωm. If their common length is 2.0m and their common resistance is 2.0Ω, calculate the individual cross-sectional areas of A and B.
(iii) When the same current passes through both wires for the same time, which wire will produce more heat? Support your answer with suitable reasoning and calculation.