The terminal velocity of a small sphere settling in a viscous fluid varies as the___________________?
Correct answer: B. Inverse of the fluid viscosity
- A. First power of its diameter
- B. Inverse of the fluid viscosity
- C. Inverse square of the diameter
- D. Square of the difference in specific weights of solid & fluid
Explanation
Stokes' law gives terminal velocity proportional to dₚ²(ρₚ − ρf)/μ. Therefore it varies inversely with fluid viscosity, making option b the only correct choice.
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