Properties of Matter Part 1

In an experiment, brass and steal wires of length 1 m each with areas of cross section 1mm2 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 0.2 mm is:{Given the young’s Modulus for steel and brass are, respectively 120×109N∕m2 and 60×109N∕m2 }