Applying a pressure drop across a capillary results in a volumetric flow rate 'Q

Question

Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

Options:

A . Q/2

B . Q/4

C . Q/8

D . Q/16

Answer: Option D

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