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Physics
The viscous force on a small sphere of radius R moving in a fluid varies as
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Q. The viscous force on a small sphere of radius R moving in a fluid varies as
Mechanical Properties of Fluids
A
$\propto R^{2}$
29%
B
$\propto R$
24%
C
$\propto(1 / R)$
27%
D
$\propto(1 / R)^{2}$
19%
Solution:
According to Stokes' law
Viscous force, $F=6\, \pi \,\eta R\,v$,
so $F \propto R$