A slab consists of two parallel layers of two different materials of same thickness and area having thermal conductivities K₁ and K₂. The equivalent conductivity of the combination of

Options

(a) K₁ + K₂
(b) K₁ + K₂ / 2
(c) 2K₁K₂/K₁ + K₂
(d) K₁ + K₂/2K₁K₂

Correct Answer:

K₁ + K₂ / 2

Explanation:

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