Poiseuille’s hagen lawis: (A) F = (PA–PB) × 3.14 × r4/8nl, (B) F = (PA+PB) × 3.14 × r4/8nl, (C) F = (PA/PB) × 3.14 × r4/8nl, (D) F = (PA × PB) × 3.14 × r4/8nl
Answer is A. Poiseuille-Hagen Formula
The relation between the flow in a long narrow tube, the viscosity of the fluid, and the radius of the tube is expressed mathematically in the Poiseuille-Hagen formula: