A steel column, pinned at both ends, has a buckling load

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A steel column, pinned at both ends, has a buckling load of 200 kN. If the column is restrained against lateral movement at its mid-height, its buckling load will be

1. 200 kN
2. 283 kN
3. 400 kN
4. 800 kN

Correct Option: D

l_ess = l/2