When the tendon of a rectangular pre-stressed beam of cross-sectional area A is subjected to a load W through the centroidal longitudinal axis of beam, then the maximum stress in the beam section will be

- 1
  
  $\frac{W}{A} + \frac{M}{Z}$
- 2
  
  $\frac{W}{A} - \frac{M}{Z}$
- 3
  
  $\frac{A}{W} + \frac{Z}{M}$
- 4
  
  $\frac{A}{W} - \frac{Z}{M}$

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