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The minimum axial compressive load, $P$, required to initiate buckling for a pinned-pinned slender column with bending stiffness $EI$ and length $L$ is

  1. $P=\dfrac{\pi^2 EI}{4L^2} \\$
  2. $P=\dfrac{\pi^2 EI}{L^2} \\$
  3. $P=\dfrac{3\pi^2 EI}{4L^2} \\$
  4. $P=\dfrac{4\pi^2 EI}{L^2}$
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