Physics - Heat & Thermo Question with Solution | TestHub

A bar of Copper length 91 cm and Aluminium of length 49 cm are joined together end to end. Both rod have circular cross-section with diameter $\sqrt{\frac{1}{50\pi }}\mathrm{m}$. Free end of Copper & Aluminium are maintain at $100^{\circ }\mathrm{C}$ & $0^{\circ }\mathrm{C}$ respectively. For maintaning temperature steam at $100^{\circ }\mathrm{C}$ is continuously flowing at the end of copper & ice is continuously melting at the end of Aluminium. After reaching steady state, choose correct statement(s) [Thermal conductivity of copper is $91\mathrm{cal}{\mathrm{m}}^{-1}{}^{\circ }{\mathrm{c}}^{-1}{\mathrm{s}}^{-1}$ & Thermal conductivity of Aluminium is $49\mathrm{cal}{\mathrm{m}}^{-1}{}^{\circ }{\mathrm{c}}^{-1}{\mathrm{s}}^{-1},{\mathrm{L}}_{\mathrm{f}}=80\mathrm{cal}/\mathrm{g}\&{\mathrm{L}}_{\mathrm{v}}=540\mathrm{cal}/\mathrm{g}]$. Neglect any thermal resistance at the junction.