For laminar flow through along pipe, the pressure drop

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For laminar flow through along pipe, the pressure drop per unit length increases

1. in linear proportion to the cross-sectional area
2. in proportion to the diameter of the pipe
3. in inverse proportion to the cross-sectional area
4. in inverse proportional to the square of cross-sectional area

Correct Option: C

P₁ - P₂ =	32μUL
	D²