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Two walls of thicknesses d1 and d2 and thermal conductivities k1 and k2 are in contact. In the steady state, if the temperatures at the outer surfaces T1 and T2 are and , the temperature at the common wall is

(a) k1T1d2+k2T2d1k1d2+k2d1                      (b)k1T1+k2d2d1+d2
(c) k1d1+k2d2T1+T2T1T2                    (d) k1d1T1+k2d2T2k1d1+k2d2