A block of mass M is attached to a wire. The upper part of wire is made of steel and lower part of wire of copper ( as shown in figure ). Both parts…

A block of mass M is attached to a wire. The upper part of wire is made of steel and lower part of wire of copper ( as shown in figure ). Both parts have the same area of cross section. Neglecting the mass of wires, the ratio of longitudinal strain developed in steel and copper wires is : ( Given, Young's modulus of steel $\displaystyle =2 \times 10^{11} \mathrm{~N} / \mathrm{m}^2$ and Young's modulus of copper $\displaystyle =1.5 \times 10^{11} \mathrm{~N} / \mathrm{m}^2$ )