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In Millikan’s oil drop experiment, the two plates are 2 cm apart. When a potential difference of 2355 V is applied between them, an oil drop of radius 1 pm is found to remain suspended. Calculate the number of excess electrons on the drop.

[Density of oil = 900 kg / m3 Density of air may be ignored]

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Here, d = 2 cm = 0.02m, V = 2355V,  ρ = 900 kg m-3

Radius r of the drop = 1 μm = 10-6m, q = ?

Since the drop remain suspended.

No. of excess electron = 2

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