A beam has a solid circular cross section having diameter $d .$ If a section of the beam is subjected to a shear force, $F,$ the maximum shear stress in the cross section is given by

- 1
  
  $\frac{4}{3} \frac{F}{π d^{2}}$
- 2
  
  $\frac{16}{3} \frac{F}{π d^{2}}$
- 3
  
  $\frac{8}{3} \frac{F}{π d^{2}}$
- 4
  
  $\frac{3}{16} \frac{F}{π d^{2}}$

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