In an experiment, brass and steel wires of length 1 m each with areas of cross section 1mm
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 0.2 mm is,
[Given, the Young's Modulus for steel and brass are, respectively, 120 × 10
9
N/m
2
and 60 × 10
9
N/m
2
]