question_answer

A steel rail of length 5 m and area of cross section \[40\,c{{m}^{2}}\] is prevented from expanding along its length while the temperature rises by \[{{10}^{\text{o}}}C\]. If coefficient of linear expansion and Young's modulus of steel are \[1.2\,\times {{10}^{-5}}\,{{K}^{-1}}\] and \[2\times {{10}^{11}}N{{m}^{-2}}\] respectively, the force developed in the rail is approximately:                           [JEE Online 09-04-2017]

Answer: