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A column will buckle about the axis for which

  • A.The area is largest
  • B.The length is shortest
  • C.The radius of gyration is smallest
  • D.The radius of gyration is largest

Answer: C

The critical load is proportional to the second moment of area, so the column takes the cheapest route and buckles about its weakest axis. This is why an angle or a channel, with very different second moments about its two axes, is inefficient as a strut.

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