A carriage spring of span l consists of n plates each of thickness t and width b. If the spring carries a load W and modulus of elasticity of the spring is E, then the central deflection of the spring is

- 1
  
  $\frac{3 W l^{3}}{8 E n b t^{3}}$
- 2
  
  $\frac{3 W l}{E n b t^{3}}$
- 3
  
  $\frac{W l^{2}}{4 E n b t^{3}}$
- 4
  
  $\frac{W l^{2}}{8 E n b t^{2}}$

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