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In a Millikon's Experiment and oil drop ...

In a Millikon's Experiment and oil drop of radius `1.5 xx 10^(-6) m` and density `890 Kg//m^(3)` is held stationary between two condenser plates `1.2 cm` apart and kept at a `p.d` of `2.3 kV`. If upthrust due to air is ignored , then the number of excees electron carries by the drop will be

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