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Spherical balls of radius R are falling ...

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

A. directly proportional to R but inversely proportional to v.

B

B. directly proportional to both R and v.

C

C. inversely proportional to both R and v.

D

D. inversely proportional to R but directly proportional to v.

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The correct Answer is:
B
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