A copper rod and an aluminium rod

PHYSICS · Subjective · CBSE · Physics · Current Electricity · Current Electricity

Problem

A copper rod and an aluminium rod, each of uniform cross-sectional area

1.5\,\text{mm}^2

, are welded end-to-end to form a conductor of total length

1.0\,\text{m}

. The resistivities of copper and aluminium are

1.7\times10^{-8}\,\Omega\,\text{m}

and

2.7\times10^{-8}\,\Omega\,\text{m}

respectively. If the measured resistance of the combination is

0.015\,\Omega

, calculate the lengths of the copper section and the aluminium section.