The loss of energy due to sudden enlargement is given by

[ $A_{1,} v_{1}$ are area of cross-section and velocity at entry and $A_{2,} v_{2}$ are area of cross-section and velocity at exit]

- 1
  
  $\frac{{v_{2}}^{2}}{2 g} {(\frac{A_{2}}{A_{1}} - 1)}^{2}$
- 2
  
  ${(\frac{v_{1} - v_{2}}{2 g})}^{2}$
- 3
  
  $\frac{{v_{1}}^{2} - {v_{2}}^{2}}{2 g}$
- 4
  
  $\frac{{v_{1}}^{2}}{2 g} {(1 - \frac{A_{2}}{A_{1}})}^{2}$

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