A bar of bronze and a bar of steel are placed between two immovable supports, A and B as shown in the figure. The physical constant are : (where L = Length of bars, A = cross-sectional area, α = linear coefficient of thermal expansion, E = Young’s modulus)

Steel                                      Bronze

L = 0.5 m                              L = 0.75 m

A = 6 × 10^-4m²                    A = 12 × 10^-4 m²

α = 12 × 10^-6/°C                 α = 20 × 10^-6/°C

E = 200 GPa                         E = 100 GPa

The stresses in the steel and bronze, when temperature drops by 50°C is