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A solid sphere of radius $r_1  = 20$ $mm$ is placed concentrically inside a hollow sphere of radius $r_2 = 30$ $mm$ as shown in the figure.

The view factor $F_{21}$ for radiation heat transfer is

  1. $\dfrac{2}{3} \\$
  2. $\dfrac{4}{9} \\$
  3. $\dfrac{8}{27} \\$
  4. $\dfrac{9}{4}$
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