Question: Two rigid boards of insulating material, each with area A, have thermal conductances U 1 and U 2 . Suppose they are combined in series

Two rigid boards of insulating material, each with area A, have thermal conductances U₁ and U₂. Suppose they are combined in series to make a single insulator of area A. What is the heat flux across this insulator as a function of ΔT? Now suppose they are placed side-by side. What is the heat flux now?

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