An electric heater is placed inside a metal box which has one side open. The diagrams show four possible positions of the box.
The heater is switched on for several minutes.
In which position does the box become the hottest?

A
2 )
B
3 )
C
4 )
D
تحلیل ویدئویی تست
تحلیل ویدئویی برای این تست ثبت نشده است!