Select the correct option to test your answer: A $$\frac{{{\pi ^2}{\text{E}}I}}{{{l^2}}}$$ B $$\frac{{{\pi ^2}{\text{E}}I}}{{4{l^2}}}$$ C $$\frac{{2{\pi ^2}{\text{E}}I}}{{{l^2}}}$$ D $$\frac{{4{\pi ^2}{\text{E}}I}}{{{l^2}}}$$ Correct Answer: Option C ($$\frac{{2{\pi ^2}{\text{E}}I}}{{{l^2}}}$$) Verified correct option for Mechanical Engineering (Strength Of Materials In Me).