Spherical balls of radius R are falling in a viscous fluid of viscosity Tl with a velocity v. The retarding viscous force acting on the spherical bali is:
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a
directly proportional to R but inversely proportional to velocity v
b
directly proportional to both radius R and velocity v
c
inversely proportional to both radius R and velocity v
d
inversely proportional to R but directly proportional to velocity v