A steel plate is `0.3 m` long, `0.1m` wide and `0.012 m` thick. The plate is placed on a heating plate of identical size maintained at `100^(@)C`. The heating plate is receiving energy through a 50 W heater. The heating plate losses heat only to the steel plate which is well insulated from all sides except at the top. The top surface of the steel plate is exposed to an airstream of temperature `20^(@)C`. The top surface of the steel plate radiates like a black body. Calculate the rate at which the top surface looses heat due to convection. The surface of steel plate in contact with heating plate is at `100^(@)C`. Thermal conductivity of steel `k = 16 Wm^(-1)K^(-1)` Stefan’s constant `=5.67xx10^(-8)Wm^(-2)K^(-4)`

Answer

`30.05 watt`.