1. $$\frac{{4{\text{F}}}}{{\pi {{\text{d}}^2}}}$$
  2. $$\frac{{{\text{6F}}}}{{\pi {{\text{d}}^2}}}$$
  3. $$\frac{{{\text{8F}}}}{{\pi {{\text{d}}^2}}}$$
  4. $$\frac{{{\text{16F}}}}{{3\pi {{\text{d}}^2}}}$$

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Answer: Option 4

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