Consider the very long, inclined black surfaces (A₁, A₂) maintained at uniform temperatures of T₁ = 1000 K and T₂ = 800 K. Determine the net radiation exchange between the surfaces per unit length of the surfaces. Consider the configuration when a black surface (A₃), whose back side is insulated, is positioned along the dashed line shown. Calculate the net radiation transfer to surface A₂ per unit length of the surface and determine the temperature of the insulated surface A₃.

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Ay. T2 100 mm A. 60 100 mm