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     EduGorilla 
    Keymaster

    A solid sphere ( = 0.8) of radius, r1 = 15 cm maintained at 700 K and is placed concentrically inside a hollow sphere ( = 0.6) of radius r2 = 25 cm maintained at 500 K as shown in figure.

    The net radiative heat transfer from surface 1 to 2 is (Stefan- Boltzmann constant = 5.67×10-8 W/m2K4)

    Options :-

    1. 1.91 kW
    2. 5.81 kW
    3. 10.07 kW
    4. 2.85 kW
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