3. A liquid is flowing through a horizontal capillary tube of radius r at the rate of Vm/s. The velocity ofthe liquid at a point on the axis of the capillary tube is :
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Answer:
According to poiseuille's equation, the rate of flow of a liquid in capillary tube is given by
Q=
8μL
πr
4
ΔP
where
Q=flow rate
r=radius of the capillary tube
ΔP=pressure difference
L=length of pipe/tube
μ=coefficient of viscosity
Hence rate of flow of liquid through a capillary tube is directly proportional to the 4th power of the radius of the tube.
so the correct option is 'C'
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