If all the dimension of a prismatic bar elongating under its own weight are increased in the proportion $m : 1$ , then the total

elongation will increase in the ratio

- 1
  
  $1 : m$
- 2
  
  $1 : m^{2}$
- 3
  
  $1 : m^{3}$
- 4
  
  $1 : m^{4}$

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