The maximum elongation of a steel wire of 1 m length if the elastic limit of steel and its Young's modulus, respectively, are 8 × 10^8 N m^-2 and 2 ×…

The maximum elongation of a steel wire of $\displaystyle 1$ m length if the elastic limit of steel and its Young's modulus, respectively, are $\displaystyle 8 \times 10^8 \mathrm{~N} \mathrm{~m}^{-2}$ and $\displaystyle 2 \times 10^{11} \mathrm{~N} \mathrm{~m}^{-2}$, is :