# Basic Concept of Thermal Conductivity.

The given figure shows a composite slab of three different materials, a, b, and c with identical thickness and with thermal conductivity $$k_b > k_a > k_c$$. The transfer of energy through them as heat is non-zero and steady. The temperature difference across material a, b and c are $$\Delta T_1$$, $$\Delta T_2$$ and $$\Delta T_3$$ respectively. Then :

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