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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

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The correct Answer is:
`(K_(1)T_(1)d_(2)+K_(2)T_(2)d_(1))/(K_(1)d_(2)+K_(2)d_(1))`
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