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Problem

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Textbook Expert
Textbook ExpertVerified Tutor
25 Jan 2022

Given information

Diameter of needle

Flow rate  

Step-by-step explanation

Step 1.

The  Poiseuille's equation is

 

Rewrite the equation for  

 

The pressure difference is,

 

 

Needle's diameter is  

Thus, the radius of the needle is,

 

 

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