Physics - Elasticity Question with Solution | TestHub

A copper wire of length $1.0\mathrm{m}$ and a steel wire of length $0.5\mathrm{m}$ having equal cross-sectional areas are joined end to end. The composite wire is stretched by a certain load which stretches the copper wire by $1\mathrm{mm}$. If the Young's modulii of copper and steel are respectively $1.0\times 10^{11}$ ${\mathrm{Nm}}^{-2}$ and $2.0\times 10^{11}{\mathrm{Nm}}^{-2}$, the total extension of the composite wire is :