A composite slab has two layers of different materials with thermal conductiviti

Question

A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

Options:

A . k₁ k₂

B . (k₁ + k₂)

C . (k₁ + k₂)/ k₁ k₂

D . 2 k₁ k₂/ (k₁ + k₂)

Answer: Option D

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