What happens if a falling drop suddenly experiences no net Force in the vertical path. What type of forces apply during the Instant of falling of a drop in the viscous Fluid? What is the condition of upward terminal Velocity of oil drop in Millikan's oil drop experiment?

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Solution:

If a falling drop experiences no net force, it will fall at a constant speed known as the terminal velocity. During the fall, gravity pulls the drop down, while the viscous drag and buoyant force oppose the motion. The upward terminal velocity occurs when the drag force balances the force of gravity, and the drop no longer accelerates.