1. $$\frac{{\sqrt 2 {\text{P}}}}{{{\text{s}}l}}$$
  2. $$\frac{{\text{P}}}{{2{\text{s}}l}}$$
  3. $$\frac{{\text{P}}}{{\sqrt 2 {\text{s}}l}}$$
  4. $$\frac{{2{\text{P}}}}{{{\text{s}}l}}$$
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Answer: Option 3

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