P is the prestressed force applied to endton of a rectangular prestressed beam whose area of cross section is A and sectional modulus is Z. The minumum stress f on the beam subjected to a maximum bending moment M is

- 1
  
  $f = \frac{P}{A} - \frac{Z}{M}$
- 2
  
  $f = \frac{A}{P} - \frac{M}{Z}$
- 3
  
  $f = \frac{P}{A} - \frac{M}{Z}$
- 4
  
  $f = \frac{P}{A} - \frac{M}{6 Z}$

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