A column of height h with a rectangular cross-section of size a×2a has a buckling load of P

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

(A) P/12                   (B) P/4                        (C) P/2                       (D) 3P/4

Ans: P/12