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Viscosity & Terminal Velocity

Quick practice

Question 1 of 5

Spherical balls of radius R are fulling in a viscous fluid of viscosity \eta with a velocity v. The retarding viscous force acting on the spherical ball is 

A

directly proportional to both radius R and velocity v 

B

directly proportional to R but inversely proportional to v

C

inversely proportional to both radius R and velocity v 

D

  inversely proportional to R but directly proportional to velocity v

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