Easy
Spherical balls of radius $r$ are falling in a viscous fluid of viscosity $\eta$ with a velocity $v$. The retarding viscous force acting on the spherical ball is
- AInversely proportional to $r$ but directly proportional to velocity $v$
- BDirectly proportional to both radius $r$ and velocity $v$
- CInversely proportional to both radius $r$ and velocity $v$
- DDirectly proportional to $r$ but inversely proportional to $v$
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