A simply supported rectangular beam of span $' L'$ and depth $' d'$ carries a central load $' W'$ . The ratio of maximum

deflection to maximum bending stress is

- 1
  
  $L^{2} / 6 E d$
- 2
  
  $L^{2} / 8 E d$
- 3
  
  $L^{2} / 48 E d$
- 4
  
  $L^{2} / 12 E d$

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