Two pipe columns are required to have the same Euler buckling load P cr . Column 1 has flexural rigidity EI and height L 1 ; column 2 has flexural rigidity (4/3)EI and height L 2 . The ratio L 2 /L 1...

Two pipe columns are required to have the same Euler buckling load P_cr. Column 1 has flexural rigidity EI and height L₁; column 2 has flexural rigidity (4/3)EI and height L₂
. The ratio L₂
/L₁
at which both columns will buckle under the same load is approximately:

(A) 0.55

(B) 0.72

(C) 0.81

(D) 1.10