The stress developed in the rod is

Question

A rod of material with $E = 200\times 10^{3}Mpa$ and $\alpha = 10^{-3}mm/mm_{}^{0}\textrm{C}$ is fixed at both the ends. It is uniformly heated such that the increase in temperature is $30_{}^{0}\textrm{C}$. The stress developed in the rod is