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NEET 2003 Physics question

PhysicsThermal Properties of MatterNEET 2003

Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities and , respectively. The equivalent thermal conductivity of the slab is -

Answer: (4)

Solution

The two layers of equal thickness and equal area are in series along the direction of heat flow, so thermal resistances add: . $ = + =

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Question ID VK-089156