An elastic bar of length L, uniform cross sectional area A, coefficient of thermal expansion a, and Young's modulus E is fixed at the two ends. The temperature of the bar is increased by T, resulting in an axial stress . Keeping all other parameters unchanged, if the length of the bar is doubled, the axial stress would be b. 20 c. 0.50 d. 0.25o CE1 2017 ww a.