Figure shows three different arrangements of materials $1, 2$ and $3$ to form a wall. Thermal conductivities are $k_1 > k_2 > k_3$ . The left side of the wall is $20\,^oC$ higher than the right side. Temperature difference $\Delta T$ across the material $1$ has following relation in three cases
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In all the three cases, temperature difference along the combination is same. Thus, heat current in all the three cases are same $\Rightarrow $ temperature difference across any layer in all the three case is same
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