Together with λ λ 2 = P E I as defined before, the various critical loads are: P n = n 2 π π 2 E I ℓ ℓ 2 , for n = 0 , 1 , 2 , … … and depending upon the value of n , different buckling modes are produced as shown in figure 4. The load and mode for n=0 is the nonbuckled mode.