The Young’s modulus and thermal stress developed in a steel rod of diametre 2 cm and length 2 m is 200 GPa and 288 MPa respectively, This experiences heating from temperature $$30^\circ C$$ to $$150^\circ C$$ and the rod has been restricted in its original position. Calculate the value of coefficient of thermal expansion.

A

$$1.2 \times 10^{-5}/^\circ C$$

B

$$12 \times 10^{-4}/^\circ C$$

C

$$12 \times 10^{-5}/^\circ C$$

D

None of these