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A. Gaseous molecules in free motion
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B. Small spherical particles in viscous fluids
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C. Charged particles in electric field
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D. Large irregular particles in vacuum
Explanation
Stokes' law applies to small spherical particles in viscous fluids.
Stokes' law describes the drag force exerted on a spherical particle moving slowly through a viscous fluid.
And it is only valid for small, spherical particles moving in a laminar flow with low Reynolds numbers
Where the viscosity of the fluid plays a significant role.
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