Spherical balls of radius 'R' are fallin...

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

A

directly proportional to R but inversely proportional to `upsilon`

B

directly proportional to both radius R and velocity `upsilon`

C

inversely proportional to both radius R and velocity `upsilon`

D

inversely proportional to R but directly proportional to velocity `upsilon`.

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