A slab consists of two layers of differe...

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

`K_1+K_2`

`sqrt(K_1+K_2)`

`(2K_1K_2)/(K_1+K_2) `

`sqrt((K_1K_2)/(K_1+K_2)) `

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