A simply supported beam of span $l$ and flexural rigidity $E I$ , carries a unit point load at its centre. The strain energy in the

beam due to bending is

- 1
  
  $\frac{l^{3}}{48 E I}$
- 2
  
  $\frac{l^{3}}{192 E I}$
- 3
  
  $\frac{l^{3}}{96 E I}$
- 4
  
  $\frac{l^{3}}{16 E I}$

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