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  1. A solid sphere 1 of radius r is placed inside a hollow, closed hemispherical surface 2 of radius 4r. The shape factor F is,

    1. 1
      12

    2. 1
      2

    3. 2
    4. 12
Correct Option: A

f 11 + f 12 = 1
∴ f 12 = 1
f 21 A2 = f 12 A1

∴ f21 =
f12A1
=
1 × 4πr2
=
V
=
1
A2k(1 / 2)4π(4r)2 + π(4r)212



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