Figure shows in cross section a wall consisting of four layers with thermal conductivities \( \mathrm{K}_{1}=0.06 \mathrm{~W} / \mathrm{mK} ; \mathrm{K}_{3} \)
P \( =0.04 \mathrm{~W} / \mathrm{mK} \) and \( \mathrm{K}_{4}=0.10 \mathrm{~W} / \mathrm{mK} \). The layer thicknesses
W. are \( \mathrm{L}_{1}=1.5 \mathrm{~cm} ; \mathrm{L}_{3}=2.8 \mathrm{~cm} \) and \( \mathrm{L}_{4}=3.5 \mathrm{~cm} \). The temperature of interfaces is as shown in figure. Energy transfer through the wall is steady.
The temperature of the interface between layers 3 and 4 is :
(A) \( -1^{\circ} \mathrm{C} \)
(B) \( -3^{\circ} \mathrm{C} \)
(C) \( 2^{\circ} \mathrm{C} \)
(D) \( 0^{\circ} \mathrm{C} \)
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