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

Options

  1. Adirectly proportional to R but inversely proportional to v .
  2. Bdirectly proportional to both radius R and velocity v .
  3. Cinversely proportional to both radius R and velocity v .
  4. Dinversely proportional to R but directly proportional to velocity v .

Correct answer

B. directly proportional to both radius R and velocity v .

Step-by-step solution

Retarding viscous force =6 R v

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