A wall consists of alternating blocks wi...

A wall consists of alternating blocks withlength 'd' and coefficient of thermal conductivity `k_(1)` and `k_(2)`. The cross sectional area of the blocks are the same. The equivalent coefficient of thermal conductivity of the wall between left and right is:-

`K_1 + K_2`

`((K_1 + K_2))/2`

`(K_1K_2)/(K_1+K_2)`

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

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