VITEEE 2017 Paper

The equivalent electrical circuit of the arrangement is shown in figure.

Temperature difference between the end points A and D = 200 - 20 = 180°C
As the resistances for the three parts are equal, the temperature difference must be distributed equally in the three parts (= 180/ 3 = 60°C)
∴ Temperature of B=200°C - 60° = 140°C.