1. $$\frac{{{\pi ^2}{\text{E}}I}}{{{l^2}}}$$
  2. $$\frac{{{\pi ^2}{\text{E}}I}}{{4{l^2}}}$$
  3. $$\frac{{2{\pi ^2}{\text{E}}I}}{{{l^2}}}$$
  4. $$\frac{{4{\pi ^2}{\text{E}}I}}{{{l^2}}}$$
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Answer: Option 3

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