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Q.

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 

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a

Inversely proportional to both radius 'r' and velocity 'v'

b

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

c

Inversely proportional to 'r' but directly proportional to velocity 'v'

d

Directly proportional to both radius 'r' and velocity 'v'

answer is B.

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Detailed Solution

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F = 6πηrv

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