1. $$\frac{{{\text{W}}l}}{{{\text{nb}}{{\text{t}}^2}}}$$
  2. $$\frac{{3{\text{W}}l}}{{2{\text{nb}}{{\text{t}}^2}}}$$
  3. $$\frac{{2{\text{W}}l}}{{{\text{nb}}{{\text{t}}^2}}}$$
  4. $$\frac{{3{\text{W}}l}}{{{\text{nb}}{{\text{t}}^2}}}$$
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Answer: Option 2

Let'

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