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A cylindrical rod of length $h$ and diameter $d$ is placed inside a cubic enclosure of side length $L. S$ denotes the inner surface of the cube. The view-factor $F_{S-S}$ is

  1. $0$
  2. $1$
  3. $\frac{\left(\pi d h+\pi d^2 / 2\right)}{6 L^2}$
  4. $1-\frac{\left(\pi d h+\pi d^2 / 2\right)}{6 L^2}$

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