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What is the expression for crippling load for a column of length L, with one end fixed and other end free?
$$P = \pi^2 \frac {EI}{4L^2}$$
$$P = \pi^2 \frac {EI}{L^2}$$
$$P = 2 \pi^2 \frac {EI}{L}$$
$$4 \pi^2 \frac {EI}{L^2}$$
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