Reynold's number has the dimension of:

viscosity

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terminal velocity

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density

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none of these

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Solution

The correct option is C none of these
Reynold's number is a dimensionless quantity. it is given by
$N_{R} = \frac{ρ D v_{c}}{η}$
Dimension of $N_{R}$ is $\frac{[M L^{- 3}] [L] [L T^{- 1}]}{[M L^{- 1} T^{- 1}]} = [M^{0} L^{0} T^{0}]$

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