The magnitude of force developed by raising the temperature from $0^{\mathrm{o}}\mathrm{C}\mathrm{to}{100}^{\mathrm{o}}\mathrm{C}$ of an iron bar 1m long and of $1 {\mathrm{cm}}^2$ cross section when it is held between two rigid walls so that it is not permitted to expand is $\left(\mathrm{\alpha }={10}^{-5}{/}^{\mathrm{o}}\mathrm{C}\mathrm{and}\mathrm{Y}={10}^{11}\mathrm{N}/{\mathrm{m}}^2\right)$