Question

The rate of flow of liquid through a capillary tube in an experiment (to determine the viscosity of liquid) increases

• A. When the pressure of the tube is decreased
• B. When the length of the tube is increased
• C. When the radius of the tube is increased
• D. None of the above

Answer 1

The correct option is C When the radius of the tube is increased

Rate of flow
$Q=\frac{\pi \left(\Delta P\right)r^4}{8\eta l}$
$Q\propto r^4$
As radius of tube increases; rate of flow increases.