In a Millikan Oil-Drop type experiment, oil drops with an excess charge of two electrons are  suspended between the two plates. If the mass of the oil drop is one million times the mass of the  proton, and the plates are 2.5 cm apart, what is the voltage of the upper plate relative to that of the  lower plate? Assume a uniform field between the two plates.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.