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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 v

B

directly proporbanal to both radius R and velocity v.

C

inversly proportional to both radius R and velocity v.

D

inversly proportional to R but directly proportional to velocity v

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