A metallic bar of Young's modulus, 0.5 × 10^11 N m^-2 and coefficient of linear thermal expansion 10^-5^° C^-1, length 1 m and area of cross-section…

A metallic bar of Young's modulus, $\displaystyle 0.5 \times 10^{11} \mathrm{~N} \mathrm{~m}^{-2}$ and coefficient of linear thermal expansion $\displaystyle 10^{-5}{ }^{\circ} \mathrm{C}^{-1}$, length $\displaystyle 1$ m and area of cross-section $\displaystyle 10^{-3} \mathrm{~m}^2$ is heated from $\displaystyle 0^{\circ} \mathrm{C}$ to $\displaystyle 100^{\circ} \mathrm{C}$ without expansion or bending. The compressive force developed in it is: