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Two walls of thicknes l(1) and l(2) and ...

Two walls of thicknes `l_(1)` and `l_(2)` and ther-mal condctivities `K_(1)` and `K_(2)` are in contact In the steady state, if the temperature at the outer faces are `T_(1)` and `T_(2)` find the temperature at the common wall .

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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