A plane wall of thermal conductivity of 45 ( frac{W}{mK} ) was initially maintained at a temperature of 35 C. It is subjected to an ambient temperature of 45 C at one surface. If the heat transfer coefficient at the surface of the wall is 9 ( frac{W}{m^2K} ), then what is the temperature gradient developed at the surface?

A plane wall of thermal conductivity of 45 ( frac{W}{mK} ) was initial

1.	A plane wall of thermal conductivity of 45 ( frac{W}{mK} ) was initially maintained at a temperature of 35 C. It is subjected to an ambient temperature of 45 C at one surface. If the heat transfer coefficient at the surface of the wall is 9 ( frac{W}{m^2K} ), then what is the temperature gradient developed at the surface?
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

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