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A slab consists of two parallel layers o...

A slab consists of two parallel layers of two different materials of same thickness having thermal conductivities `K_(1) and K_(2)`. The equivalent conductivity of the combination is

A

`k_1 +k_2`

B

`(k_1+k_2)/(2)`

C

`(2k_1k_2)/(k_1+k_2)`

D

`(k_1 +k_2)/(2k_1k__2)`

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