Three bars of aluminium, brass and copper are of equal length and cross section. The three pieces are joined together as shown in A, B and C and the ends are maintained at `100^(@)C` and `0^(@)C`. The thermal conductivities of aluminium, brass and copper are in ratio 2 : 1 : 4. Assume no heat loss through curved surface of the bar and that the system is in steady state.
(a) In which of the three cases (A, B or C) the temperature difference across aluminium bar will be maximum?
(b) Draw a graph showing variation of temperature from one end of the bar to another in case B.