The classic Millikan oil drop experiment was the first to obtain an accurate measurement of the charge on an electron. In it, oil drops were suspended againstgravity by a vertical electric field.GIAssume the oil drop to be 2.20 μm in radius and have a density of 957 kg/m³.(a) Find the weight of the drop.N+microscope(b) If the drop has a single excess electron, find the magnitude of the electric field strength needed to balance its weight.N/C

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