An electrical water (k = 0.61 W/m•K) heater uses natural convection to transfer heat from a 1-cm diameter by 0.65-m long, 110 V electrical resistance heater to the water. During operation, the surface temperature of this heater is 120oC while the temperature of the water is 35oC, and the Nusselt number (based on the diameter) is 6. Considering only the side surface of the heater (and thus A = πDL), the current passing through the electrical heating element is
(a) 3.2 A
(b) 3.7 A
(c) 4.6 A
(d) 5.8 A
(e) 6.6 A
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