Two wires each of radius \( 0.2 \, \text{cm} \) and negligible mass, one made of steel and the other made of brass are loaded as shown in the figure. The elongation of the steel wire is ______ \( \times 10^{-6} \, \text{m} \). [Young’s modulus for steel \( = 2 \times 10^{11} \, \text{N m}^{-2} \) and \( g = 10 \, \text{m s}^{-2} \)]
