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[" 30.An oil drop carrying charge "*Q'" ...

[" 30.An oil drop carrying charge "*Q'" is held in "],[" equilibrium by a potential difference of "600V],[" between the horizontal plates.In order to hold "],[" another drop of twice the radius in ordilibrium "],[" a potential drop of "1600V" had to be "],[" maintained.The charge on the second drop is "],[[" 1) "(Q)/(2)," 2) "2Q," 3) "(3Q)/(2)," 4) "3Q]]

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