question_answer

In an environment, brass and steel wires of length 1 m each with areas of cross section \[1\text{ }m{{m}^{2}}\] 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 (in \[N{{m}^{-2}}\]) required to produce a net elongation of 0.2 mm is, [Given, the Young's modulus for steel and brass are, respectively,\[120\times {{10}^{9}}N/{{m}^{2}}\,and\,60\times {{10}^{9}}N/{{m}^{2}}\]]

Answer:

\[\left( \mathbf{8}\times \mathbf{1}{{\mathbf{0}}^{\mathbf{6}}} \right)\]