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Two walls of thickness d and d and thermal conductivities k and k are in contact. In the steady state, if the temperature at the outer faces 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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