A room is heated by a 1.2 kW electric resistance heater whose wires have a diameter of 4 mm and a total length of 3.4 m. The air in the room is at 23ºC and the interior surfaces of the room are at 17ºC. The convection heat transfer coefficient on the surface of the wires is 8 W/m2•ºC. If the rates of heat transfer from the wires to the room by convection and by radiation are equal, the surface temperature of the wires is
(a) 3534ºC
(b) 1778ºC
(c) 1772ºC
(d) 98ºC
(e) 25ºC
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