In an experiment, brass and steel wires of length 1 m each with areas of cross section 1 mm^2 are used. The wires are connected in series and one end…

In an experiment, brass and steel wires of length $\displaystyle 1$ m each with areas of cross section $\displaystyle 1 \mathrm{~mm}^2$ are used. The wires are connected in series and one end of the combined wire is connected to a rigid support and other end is subjected to elongation. The stress required to produce a net elongation of $\displaystyle 0.2$ mm is, [Given, the Young's Modulus for steel and brass are, respectively, $\displaystyle 120 \times 10^9 \mathrm{~N} / \mathrm{m}^2$ and $\displaystyle 60 \times 10^9 \mathrm{~N} / \mathrm{m}^2$ ]