In R.A. Millikan's oil drop experiment, when the charged oil droplets are made stationary by adjusti — Atomic Structure Chemistry Question

💡 Solution & Explanation

When the oil drop becomes stationary, its velocity is zero, so viscous drag becomes zero. The upward electrostatic force ($qE$) is exactly balanced by the downward gravitational force ($mg$), causing the forces to cancel out. [16, 17]