For the three dimensional object shown in figure below, five faces are insulated. The sixth face (PQRS), which is not insulated, interacts thermally with the ambient, with a convective heat transfer coefficient of 10 W/m$$^2$$-K. The ambient temperature is $$30^\circ C$$. Heat is uniformly generated inside the object at the rate of 100 W/m$$^3$$. Assuming the face PQRS to be at uniform temperature, its steady state temperature is