Spherical balls of radius R are falling in a viscous fluid of viscosity ¬¨¬™‚Äö√Ñ‚Ä† with a velocity v. The retarding viscous force acting on the spherical ball i?#

Inversely proportional to both radius R and velocity v

Directly proportional to R but inversely proportional to v

Directly proportional to both radius R and velocity v

Inversely proportional to R but directly proportional to velocity v

Spherical balls of radius R are falling in a viscous fluid of viscosit

1.	Spherical balls of radius R are falling in a viscous fluid of viscosity ¬¨¬™‚Äö√Ñ‚Ä† with a velocity v. The retarding viscous force acting on the spherical ball i?#
A.	Directly proportional to R but inversely proportional to 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
Answer» C. Inversely proportional to both radius R and velocity v