A steel rail of length $5 \mathrm{m}$ and area of cross section $40 {\mathrm{cm}}^2$ is prevented from expanding along its length while the temperature rises by $10°\mathrm{C}$ . If coefficient of linear expansion and Young's modulus of steel are $1.2\times {10}^{-5} {\mathrm{K}}^{-1}$ and $2\times {10}^{11} \mathrm{N} {\mathrm{m}}^{-2}$ respectively, the force developed in the rail is approximately: