NCERT · Class 11 · Physics · Mechanical Properties of FluidsAccording to Stokes' Law, the viscous force ($F$) acting on a sphere of radius $r$ moving with velocity $v$ in a fluid of viscosity $\neta$ is given by:
Step-by-Step Solution
Stokes' Law states that viscous drag force acting on a small sphere moving in a viscous fluid is $F = 6\pi\eta rv$.
Detailed Options Breakdown
Option : $F = 6\pi\eta rv$ (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 1: $F = 6\pi\eta r^2v$
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Mechanical Properties of Fluids.
Option 2: $F = 3\pi\eta rv$
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Mechanical Properties of Fluids.
Option 3: $F = \frac{6\pi\eta r}{v}$
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Mechanical Properties of Fluids.
💡 Study Guide: This question tests core syllabus concepts from Mechanical Properties of Fluids. For formulas, key summaries, and mock exam reference guides, read the full Mechanical Properties of Fluids Revision Notes.