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A small metal sphere of radius a is fall...

A small metal sphere of radius a is falling with a velocity through a verticle column of a viscous liquid. If the coefficient of viscosity of the liquid is `eta`, then the sphere encounters an opposing force of

A

`6 pi eta a^2 v`

B

`(6 eta v)/(pia)`

C

`6 pi eta a v`

D

`(pietav)/(6a^3)`

Text Solution

Verified by Experts

The correct Answer is:
C
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