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Two walls of thickness d(1) and d(2) and...

Two walls of thickness `d_(1) and d_(2)` and thermal conductivites `K_(1) and K_(2)` are in contact. In the steady state, if the temperature at the outer surfaces are `T_(1) and T_(2)` the temperature at the common wall is

A

`(K_(1)T_(1)+K_(2)T_(2))/(d_(1)+d_(2))`

B

`(K_(1)T_(1)d_(2)+K_(2)T_(2)d_(1))/(K_(1)d_(2)+K_(2)d_(1))`

C

`((K_(1)d_(1)+K_(2)d_(2))T_(1)T_(2))/(T_(1)+T_(2))`

D

`(K_(1)d_(1)T_(1)+K_(2)d_(2)T_(2))/(K_(1)d_(1)+K_(2)d_(2))`

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