Physics - Heat & Thermo Question with Solution | TestHub

Two rods of copper and steel, each of the same area of cross-section but of different lengths ${\mathrm{L}}_{\mathrm{c}}$ and ${\mathrm{L}}_{\mathrm{s}}$ are heated by the same source such that one of their ends is kept at the temperature T of the source while their other ends are maintained at 0°C under steady state conditions. (heat flow is same in both) If the linear thermal conductivity of copper and steel be ${\mathrm{K}}_{\mathrm{c}}$ and ${\mathrm{K}}_{\mathrm{s}}$, then the ratio ${\mathrm{L}}_{\mathrm{c}}/{\mathrm{L}}_{\mathrm{s}}$ will be given by :-