If l is the moment of inertia of a section about the axis and A is its effective sectional area, then the radius of gyration (r) of the section about the axis, is equal to

- 1
  
  $\sqrt{\frac{l}{A}}$
- 2
  
  $\sqrt{\frac{l}{2 A}}$
- 3
  
  $\sqrt{\frac{l}{3 A}}$
- 4
  
  $\sqrt{\frac{l}{4 A}}$

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