In a particular Millikan oil-drop apparatus, the plates are 2.25 cm apart. The oil used has...

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Physics

In a particular Millikan oil-drop apparatus, the plates are 2.25cm apart. The oil used has a density of 0.815 g/cm3 , and theatomizer that sprays the oil drops produces drops of diameter1.00×10−3 mm.  

A) What strength of electric field is needed tohold such a drop stationary against gravity if the drop containsfive extra electrons?

B) What should be the potential differenceacross the plates to produce this electric field?

C) If another drop of the same oil requires aplate potential of 65.3 V to hold it stationary, how many excesselectrons did it contain?

Answer & Explanation Solved by verified expert
4.0 Ratings (602 Votes)
In Milikans experiment Using force balance on the oil drop Since we know that gravitational force will balance the electrostatic force on oil drop And gravitational force is always downward which means    See Answer
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