what did the oil drop experiment do

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1. http://wps.prenhall.com/wps/media/objects/165/169289/GIFS/AAAUATE0.JPG

   

2. Millikan's Oil Drop Experiment

   

3. Millikens Oil Drop Experiment

   

4. Millikens Oil Drop Experiment

   

5. Millikan oil-drop experiment

   

6. Oil Drop Experiment