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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 direcly 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

Directly proportional to 'r' but inversely proportional to 'v'

Text Solution

Verified by Experts

The correct Answer is:
B
`F=6 pi eta rv`
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