Heat Is Transferred Steadily Through a 0

Multiple Choice

Heat is transferred steadily through a 0.15-m thick 3 m by 5 m wall whose thermal conductivity is 1.2 W/m.°C. The inner and outer surface temperatures of the wall are measured to be 18°C to 4°C. The rate of heat conduction through the wall is

A) 112 W
B) 3360 W
C) 2640 W
D) 38 W
E) 1680 W