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A drop-like particle has a density of $10^{3} kg/m^{3}$. It falls through a fluid of $\eta=10^{-3}$ with a terminal velocity of $2.2 \times 10^{-6} m/sec$. The radius of the particle will be:
Difficulty: Easy
A: 
$10^{-3}$ m
B: 
$10^{-4}$ m
C: 
$10^{-5}$ m
D: 
$10^{-6}$ m
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