If p is the net upward pressure on a square footing of side b for a square column of side a, the maximum bending moment is given by

- 1
  
  $B . M . = \frac{p b (c - a)}{4}$
- 2
  
  $B . M . = \frac{p b {(b - a)}^{2}}{4}$
- 3
  
  $B . M . = \frac{p b {(b - a)}^{2}}{8}$
- 4
  
  $B . M . = \frac{p b (b + a)}{8}$

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