Figure shows the cross section of a wall made of three layers. The layer thicknesses are L₁, L₂ = 0.700L₁ and L₃ = 0.350L₁. The thermal conductivities are k₁, k₂ = 0.900k₁ and k₃ = 0.800k₁. The temperatures at the left and right sides of the wall are T_H = 30.0°C and T_c = – 15.0°C, respectively. Thermal conduction is steady.

(a) What is the temperature difference ∆T₂ across layer 2 (between the left and right sides of the layer)? If k₂ were, instead, equal to 1.1k₁

(b) Would the rate at which energy is conducted through the wall be greater than, less than, or the same as previously, and

(c) What would be the value of ∆T₂?

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