A beam simply supported at both the ends, of length $' L ‵$ carries two equal unlike couples $M$ at two ends. If the flexural

rigidity, $E I =$ constant, then the central deflection of beam is given by

- 1
  
  $\frac{M L^{2}}{4 E I}$
- 2
  
  $\frac{M L^{2}}{16 E I}$
- 3
  
  $\frac{M L^{2}}{64 E I}$
- 4
  
  $\frac{M L^{2}}{8 E I}$

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