Temperatures Interchanged

Ram has joined two rods \(A\) and \(B\) of different materials but the same length and cross-sectional area end to end, as shown. When he maintained the end of rod \(A\) at \(100\, ^\circ\text{C}\) and the end of rod \(B\) at \(0\, ^\circ\text{C},\) the temperature at the junction was found to be \(70\, ^\circ\text{C}.\)

If he reverses the end temperatures, i.e. if he maintains the end \(A\) at \(0\, ^\circ\text{C}\) and the end of \(B\) at \(100\, ^\circ\text{C},\) what will be the junction temperature?


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