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A water droplet of radius 1 micron in M...

A water droplet of radius 1 micron in Milikan oil drop appartus in first held stationary under the influence of an electric field of intensity `5.1xx10^(4) NC^(-1)`. How many excess electrons does it carry ? Take `e = 1.6xx10^(-19) C, g = 9.8 ms^(-2)` and density of water of `= 10^(3) kg m^(-3)`.

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