Physics - Heat & Thermo Question with Solution | TestHub

Steel wires are fastened between the end projections of a heavy brass bar and are just taut at 0°C. The temperature rises to 200°C. ${\alpha }_{\text{brass }}=19\times 10^{-6},{\alpha }_{\text{steel }}=12\times 10^{-6}$ per ${}^{\circ }\mathrm{C},Y_{\text{steel }}=2\times 10^{11}\mathrm{N}/{\mathrm{m}}^2$. Assuming the brass bar sets the length, the tensile stress in the wires is: