A thin bar 2m long and 0.3cm in diameter is placed in a room at a constant temperature of 15, as shown in the figure. When closing the switch, an electric current is generated responsible for heating the bar, which once it reaches its stable state, the temperature of its surface is constant and equal to 152. Under these conditions, the voltage drop and electric current are measured, and the results are 60 V and 1.5 A, respectively. Neglecting heat transfer by radiation, determine the coefficient of heat transfer by convection between the outer surface of the bar and the air in the room.

15A HHH A 60 V