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A composite body consists of two rectang...

A composite body consists of two rectangular plates of the same dimensions but different thermal conductivities `K_A and K_B` . This body is used to transfer heat between two objects maintained at different temperatures. The composite body can be placed such that flow of heat takes place either parallel to the interface or perpendicular to it. Calculate the effective thermal conductivities `K_(||) and K_(bot)` of the composite body for the parallel and perpendicular orientations. Which orientation will have more thermal conductivity ?

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