an oil drop of mass 6x10^(-16)kg falls vertically in air with a terminal velocity between two parallel plates 5 mm apart when the electric field is zero. When the p.d. of 3kV is applied bw the plates, the oil drop falls with terminal velocity inclined at an angle of 72.6 degrees with the vertical moving towards the positive plate.calculate the no of electrons on the drop neglecting the upthrust because the density of air is negligible.

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