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Here is the problem which I am struggling on, please help me!
Problem: In a particular Millikan oil-drop apparatus, the plates are 2.25cm apart. The oil used has a density of 0.835g/cm3, and the atomizer that sprays the oil drops produces drops of diameter 1.00x10-3mm.
Part I: What strength of electric field is needed to hold such a drop stationary against gravity if the drop contains five excess electrons?
Part II: What should be the potential difference across the plates to produce this electric field?
Part III: If another drop of the same oil requires a plate potential of 66.9V to hold it stationary, how many excess electrons did it contain?
I need tutor help to solve the above problem.
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