A simply supported bean of circular cross-section with diameter d and length l carries a concentrated load W at the centre of the beam. The strength of the beam is proportional to

- 1
  
  $\frac{d^{2}}{l}$
- 2
  
  $\frac{d^{3}}{l}$
- 3
  
  $\frac{l}{d^{2}}$
- 4
  
  $\frac{l}{d^{3}}$

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