A brass of length `2 m` and cross-sectional area `2.0 cm^(2)` is attached end to end to a steel rod of length and cross-sectional area `1.0 cm^(2)`. The compound rod is subjected to equal and oppsite pulls of magnitude `5 xx 10^(4) N` at its ends. If the elongations of the two rods are equal, the length of the steel rod `(L)` is
{`Y_(Brass) = 1.0 xx 10^(11) N//m^(2) ` and `Y_(steel) = 2.0 xx 10^(11) N//m^(2)`