Question

In Millikan’s oil drop experiment, an oil drop is observed to
move vertically upward. The upward motion of the drop is
due to
(a) gravity (b) viscosity
(c) buoyancy (d) electric field

Answer 1

Answer:

(a) gravity

Explanation:

In Millikan's oil drop experiment, the motion of oil drop is due to gravitational force and then the motion is due to electric field. In the first case, when the oil drop moves downwards due to gravitational force, the viscous force acts in upward direction opposing its motion.

Answer 2

Answer:

The answer is (d) Electric Field.

Because in Millikan's oil drop expirement, the oil drop is balanced in the Electric Field.

Hope it helps you !