Spherical balls of radius R are falling in a viscous fluid of viscosity η with a velocity v. The retarding viscous force acting on the spherical ball is

(B) directly proportional to both radius R and velocity v

(A) inversely proportional to both radius R and velocity v

(C) directly proportional to R but inversely proportional to v

(D) inversely proportional to R, but directly proportional to velocity v

Properties of Solids and Liquids: JEE Main 2004 Physics question

JEE Main 2004 · Annual, Paper 1 · Q7891

JEE Main 2004Annual, Paper 1PhysicsEasyProperties of Solids and Liquids184× since 2002

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