In an experiment to determine the Young's modulus, steel wires of five different lengths $(1,2,3,4$, and $5 \mathrm{~m})$ but of same cross section $$\left(2 \mathrm{~mm}^{2}\right)$$ were taken and curves between extension and load were obtained. The slope (extension/load) of the curves were plotted with the wire length and the following graph is obtained. If the Young's modulus of given steel wires is $x \times 10^{11} \,\mathrm{Nm}^{-2}$, then the value of $x$ is $\underline{\hspace{2cm}}$.