$A$ rod is fixed between two points at $20\,^oC$. The coefficient of linear expansion of the material of the rod is $1.1 \times 10^{-5}/\,^oC$ and Young's modulus is $1.2 \times 10^{11}\,N/m^2$. Find the stress developed in the rod if the temperature of the rod becomes $10\,^oC$.
- A$1.32 \times 10^7\,N/m^2$
- B$1.10 \times 10^{15}\,N/m^2$
- C$1.32 \times 10^{8}\,N/m^2$
- D$1.10 \times 10^{6}\,N/m^2$
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