What will be the thermal stress developed in a rod having a diametre of 4 cm and length of 2 m-.It experiences heating from temperature $$50^\circ C$$ to $$200^\circ C$$. The coefficient of thermal expansion is $$\alpha = 10 \times 10^{-6}/^\circ C$$ and young’s modulus is 250 GPa?

A

300

B

325

C

350

D

375