When both ends of the column are hinged, the crippling load at which the column just buckled is
(Where E is Young’s modulus of column, I is Moment of inertia of column and L is effective length of column.)
1
\(\frac{\pi^2 EI}{L^2}\)
2
\(\frac{\pi^2 EI}{2L^2}\)
3
\(\frac{\pi EI}{L^2}\)
4
\(\frac{2\pi^2 EI}{L^2}\)