Assertion A: Gravity influences the pipe flow.

Reason R: Gravity term (g) appears explicitly in Darcy-Weisbach formula for pipe flow resistance.

- 1
  
  Both A and R are true and R is the correct explanation of A
- 2
  
  Both A and R are true but R is not a correct explanation of A
- 3
  
  A is true but R is false
- 4
  
  A is false but R is true

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