A shaft of diameter $' d'$ is subjected to bending moment $' M'$ and twisting moment $' T' .$ The developed principal stress will be

- 1
  
  $\pm \frac{16}{π d^{3}} \sqrt{M^{2} + T^{2}}$
- 2
  
  $\frac{16}{π d^{3}} (M \pm \sqrt{M^{2} + T^{2}})$
- 3
  
  $\frac{16}{π d^{3}} (T \pm \sqrt{M^{2} + T^{2}})$
- 4
  
  $\frac{16}{π d^{3}} \sqrt{M^{2} + T^{2}} \pm M$

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