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Grade: 12th pass
        
Q3. Spherical balls of radius ’R’ are falling in a viscous fluid of viscosity ‘?’ with a velocity ‘v’. The retarding viscous force acting on the spherical ball is
(a) inversely proportional to both radius ’R’ and velocity ‘v’
(b) directly 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’
4 years ago

Answers : (1)

Aditi Chauhan
askIITians Faculty
396 Points
							

(b) From Stoke’ s law,

Viscous force F = 6p???v

Hence F is directly proportional to radius & velocity.

4 years ago
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