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volume rate flow of a liquid of density `rho` and coefficient of viscosity `eta` through a cylindrical tube of diameter D is Q. Reynold's number of the flow is

A

`(4 rho Q) /(π eta D) `

B

`(rho Q) /(π eta D) `

C

`(πrho Q) /(4 eta D) `

D

`(πrho Q) /( eta D) `

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