A cantilever beam of span $L$ carries concentrated load $' W'$ at the free end. If the width $' b'$ of the beam is constant throughout the span, then for the beam to have uniform strength, the depth $' d'$ at the free end should be

- 1
  
  $\frac{6 W L}{b f}$
- 2
  
  $\frac{3 W L}{b f}$
- 3
  
  $\sqrt{\frac{3 W L}{b f}}$
- 4
  
  $\sqrt{\frac{6 W L}{b f}}$

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