The cable for a prestressed concrete simply supported beam subjected to uniformly distributed load over the entire span should ideally be

- 1
  
  placd at the centre of cross-section over the entire span
- 2
  
  placed at some eccentricity over the entire span
- 3
  
  varying linearly from the centre of cross-section at the ends to maximum eccentricity at the middle section
- 4
  
  parabolic with zero eccentricity at the ends and maximum eccentricity at the centre of the span

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