The head loss in a pipe of diameter d, carrying oil at a flow rate Q over a distance 1 is h. The pipe is replaced by another with half the diameter, all other things remaining the same. The head loss in this case will be

- 1
  
  0.5 h
- 2
  
  2.0 h
- 3
  
  8.0 h
- 4
  
  32.0 h

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