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# A liquid drop of mass $1\;g$ and of charge $−0.1\; C$ is placed in a uniform electric field of strength $0.2\; N/C$ directed vertically upward. $(g = 10\; m/s^2)$. At what height will the drop attain a velocity of $10\; m/s$?

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5 m is correct.
Hence B is the correct answer.
answered Jun 2, 2014 by