A shaft is subjected to a bending moment $M$ and a torque $T$ . The equivalent bending moment $' M_{e q} ‵$ on the shaft is given by

- 1
  
  $\frac{M + \sqrt{M^{2} + T^{2}}}{4}$
- 2
  
  $\frac{M^{2} + \sqrt{M + T}}{2}$
- 3
  
  $\frac{M - \sqrt{M^{2} + T^{2}}}{2}$
- 4
  
  $\frac{M + \sqrt{M^{2} + T^{2}}}{2}$

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