Physics - Elasticity Question with Solution | TestHub

An iron bar (Young's modulus $=10^{12}dynes/c{\mathrm{m}}^2$, $\alpha =10^{-6}{/}^{\circ }\mathrm{C}$) $100\mathrm{cm}$ long and $10\mathrm{c}{\mathrm{m}}^2$ in cross-section is heated from $0^{\circ }\mathrm{C}$ to $100^{\circ }\mathrm{C}$ without being permitted to bend or expand. The compressive elastic energy developed inside the bar is :