The Left Face of a One Dimensional Slab of Thickness

Multiple Choice

The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. 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