The thrust thereby generated on the clamp

Question

   

A circular steel rod of 20 cm² cross –sectional area and 10 m length is heated through 50⁰C with ends clamped before heating. Given, E = 200 GPa and coefficient of thermal expansion, α = 10 x 10^-6/C, the thrust thereby generated on the clamp is                                        

         (a) 100 kN                  (b) 150 kN

         (c) 200 kN                  (d) 250 kN