# 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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