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A column of height $h$ with a rectangular cross-section of size $a \times 2a$ has a buckling load of $P$. If the cross-section is changed to $0.5 a \times 3a$ and its height changed to 1.5$h$, the buckling load of the redesigned column will be

  1. $P/12$
  2. $P/4$
  3. $P/2$
  4. $3P/4$
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Answer is A
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