Figure shows three different arrangements of materials 1, 2 and 3 to form a wall. Thermal conductivities are k₁ > k₂ > k₃. The left side of the wall is 20°C higher than the right side. Temperature difference ΔT across the material 1 has following relation in three cases :

Question

G1 Physics · Accepted Answer

In steady conduction, heat current is H=kAΔT/L. Treat each segment as a thermal resistance Rₜₕ=L/(kA); series resistances add and parallel heat currents add. Evaluating the given data/statements gives B: ΔTa =ΔTb =ΔTc. Therefore the correct answer is B.

Figure shows three different arrangements of materials 1, 2 and 3 to form a wall. Thermal conductivities are k₁ &gt; k₂ &gt; k₃. The left side of the wall is 20°C higher than the right side. Temperature difference ΔT across the material 1 has following relation in three cases :

Figure shows three different arrangements of materials 1, 2 and 3 to form a wall. Thermal conductivities are k₁ > k₂ > k₃. The left side of the wall is 20°C higher than the right side. Temperature difference ΔT across the material 1 has following relation in three cases :