A ring (E = 0.85) of 8 cm inner and 16 cm outer diameter is placed in a horizontal plane. A small element (E = 0.7) of 1 cm² is placed concentrically 8 cm vertically below the center of the ring. The temperature of the ring is 800 K and that of small area is 400 K. Find the radiant heat gain by the small ring

• A. – 10.59 J/hour
• B. – 11.59 J/hour
• C. – 12.59 J/hour
• D. – 13.59 J/hour