When a force is applied on a wire of uniform cross-sectional area $3\times {10}^{-6}{ \mathrm{m}}^2$ and length $4 \mathrm{m}$, the increase in length is $1 \mathrm{mm}$. Energy stored in it will be $\left(\mathrm{Y}=2\times {10}^{11} \mathrm{N}/{\mathrm{m}}^2\right)$

A $1 \mathrm{m}$ long metal wire of cross sectional area ${10}^{-6}{ \mathrm{m}}^2$ is fixed at one end from a rigid support and a weight $W$ is hanging at its other end. The graph shows the observed extension of length $\Delta \ell$ of the wire as a function of $W$. Young's modulus of material of the wire in $\mathrm{SI}$ units is

A liquid has only