MHT CET 2023 Physics question
A composite slab consists of two materials having coefficient of thermal conductivity K and 2K, thickness x and 4x respectively. The temperature of the two outer surfaces of a composite slab are and (). The rate of heat transfer through the slab in a steady state is where 'f' is equal to
Answer: (D)
Solution
In steady state the same heat current flows through both layers, so their thermal resistances add in series. Layer 1: . Layer 2: . Total . Rate of heat flow:
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