Two walls of thickness d1 and d2 ,thermal conductivities K1 and K2 are in contact.In the steady state if the temperatures at the outer surfaces are T1 and T2 , the temperature at the common wall will be
A
K1T1+K2T2d1+d2
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B
K1T1d2+K2T2d1K1d2+K2d1
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C
(K1d1+K2d2)T1T2T1+T2
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D
(K1d1T1+K2d2T2)K1d1+K2d2
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