What is the expression for crippling load P when one end of the column is fixed and the other end is free? E - Young’s modulus of elasticity, I - moment of inertia, l - length of the column.
1
\(\frac{{{\pi ^2}EI}}{{{{8l}^2}}}\)
2
\(\frac{{{\pi ^2}EI}}{{{{4l}^2}}}\)
3
\(\frac{{{2\pi ^2}EI}}{{{{l}^2}}}\)
4
\(\frac{{{\pi ^2}EI}}{{{{l}^2}}}\)