The left face of a one dimensional slab of thickness 0.2 m is maintained at 80C and the right face is exposed to air at 30C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m2.K. At steady state, the temperature of the right face in C is____________________?

A. 77.2

B. 71.2

C. 63.8

D. 48.7
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