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				| 1. | A plane wall is 20 cm thick with an area of 1 m2 and has a thermal conductivity of 0.5 W/m. K. A temperature difference of 100°C is imposed across it. The heat flow is at: | 
| A. | 150 W | 
| B. | 180 W | 
| C. | 220 W | 
| D. | 250 W | 
| Answer» E. | |