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If $\rho$ is the density and $\eta$ is coefficient of viscosity of fluid which flows with a speed $v$ in the pipe of diameter $d$, the correct formula for Reynolds number $R _{ e }$ is ..............
  • A$R _{ e }=\frac{\eta d}{\rho v}$
  • B$R_{e}=\frac{\rho v}{\eta d}$
  • C$R _{ e }=\frac{\rho vd }{\eta}$
  • D$R _{ e }=\frac{\eta}{\rho vd }$
JEE MAIN 2022, Easy
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