What is the principle of millikans oil drop method, Physics

Q. What is the principle of Millikan's oil drop method?

Principle

This method is foundation on the study of the motion of uncharged oil drop under free fall due to gravity and charged oil drop in a uniform electric field.

By adjusting identical electric field suitably a charged oil drop can be made to move up or down or even kept balanced in the field of view for adequately long time and a series of observations can be made.

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