Figure 1 shows a composite wall. The outer surfaces are exposed to the atmosphere at 25°C and a convection heat transfer coefficient of 1000 W/m2 ⋅ K. The middle wall B experiences uniform heat generation (qB), while there is no generation in the other walls A and C. The temperatures at the interfaces are T1 = 300 °C and T2 = 230 °C. If the thermal conductivity of A and C are kA = 24 W/m.K, kC = 50 W/m.K, and LA = 40 mm, LB = 50 mm and LC = 40 mm. Determine the volumetric heat generation qB.