If L is the lever arm in a reinforced concrete beam, S is the total perimeter of the steel bars and is the shear force, then the bond stress developed in concrete arond the steel reinforcement is equal to

- 1
  
  $\frac{F . S}{L}$
- 2
  
  $\frac{F . L}{S}$
- 3
  
  $\frac{F}{S . L}$
- 4
  
  F.S.L

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