A slab consists of portions of different materials of the same thickness and length connected in series. The materials have conductivities K 1 and K 2 . The equivalent thermal conductivity of the slab is

Question

A slab consists of portions of different materials of the same thickness and length connected in series. The materials have conductivities K 1 and K 2 . The equivalent thermal conductivity of the slab is, K 1 + K 2, K 1 + K 2, 2 K 1 K 2 K 1 + K 2, K 1 K 2 K 1 + K 2

MARKS App · Accepted Answer

As two portions of the slab are connected in series, therefore K = ∑ x i ∑ x i K 1 = d + d d K 1 + d K 2 = 2 d d 1 K 1 + 1 K 2 = 2 K 1 K 2 K 1 + K 2

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