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


Options:
A .  77.2
B .  71.2
C .  63.8
D .  48.7
Answer: Option D



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