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Millikan's Oil Droplet Experiment
Aim:
Robert Millikan set out to discover the charge on an electron in 1909 as the smallest unit charge a
particle could have.

Apparatus :



Atomiser
Oil droplets

Oil Charged plate




Battery




Microscope


Charged Plate

Method :
The atomiser was used to spray small droplets of…

Page 2

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air resistance is equal to the downwards force of gravity, so

Since the mas of the drop is the volume multiplied by the density of the oil this equation equals




Millikan had already measured and in previous experiments and could calculate r for each oil droplet.




+
-




The upward…

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