3. A steel bar 10.0 cm long is welded end to end to a copper bar 20.0 cm long. Each bar has a square cross section 2.00 cm on one side. The free end of the steel bar is kept at 100 °C by placing it in contact with steam, and the free and of the copper bar is kept at 0 °C by placing it in contact with ice. Both bars are perfectly insulated on their sides. a) Find the steady state temperature at the junction of the two bars, Steel T Copper TH = 100°C ///// 2.00 cm / / /|TC = 0°C b) Determine the total heat flow (heat current) through the bars. c) Suppose the two bars from above are now separated and then reconnected such that one end of each bar is kept at 100 °C and the other end is kept at 0 °C as shown in the second figure. What is the total heat current in the two bars now? T= 100°C 10.0 cm 20.0 cm Copper //// 12.00 cm /// TC = 0°C 20.0 cm Steel T=100°C 12.00cm Te=0°C 10.0cm-