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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

directly proporational to r but inversely proporational to v.

B

directly proporational to both r and v.

C

inversely proporational to both r and v.

D

inversely proporational to r but directly proporational to velocity v.

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The correct Answer is:
B
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