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In an experiment with poiseuille's appar...

In an experiment with poiseuille's apparatus , the following observation were noted :
Volume of liquid collected per minute `=15cm ^(3)`
Head of liquid =30cm, Length of tube =25 cm
Diameter of tube =0.2 cm, Density of liquid =`2.3 gcm^(-3)`
Find the coefficient of viscosity of the liquid.

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