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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

inversely proportional to 'r' but directly proportional to velocity 'v'.

B

directly proportional to both radius 'r' and velocity 'v'

C

inversly proportional to both radius 'r' and velocity 'v'

D

directly proportional to 'r' but inversely proprtional to 'v'

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