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In the Millikan's experiment, the oil dr...

In the Millikan's experiment, the oil drop is subjected to a horizontal electric field of `2` N//S and the drop moves with a constant velocity making an angle of `45^(0)`with the horizontal . If the weight of the drop is `W`, then the electric charge, in coulomb, on the drop is

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A: The oil-drops of Millikan's experiment should be microscopic size. R: For larger drops the electric fields needed in the experiment will be impractically high.