A column of length l is hinged at both the ends restrained from lateral displacement at mid-height. The critical load of the column is given by

- 1
  
  $\frac{π^{2} E l}{l^{2}}$
- 2
  
  $\frac{2 π^{2} E l}{l^{2}}$
- 3
  
  $\frac{4 π^{2} E l}{l^{2}}$
- 4
  
  $\frac{π^{2} E l}{4 l^{2}}$

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