A charged oil drop is to be held stationary between two plates separated by a distance of 25mm. If the mass of the drop is 5 imes {{10}^{-15}}kg and the charge on it is {{10}^{-18}}C, the potential to be applied between the two plates is (g=10 m{{s}^{-2}}) a) (a)125V b) 1250 V c) 2500 V d) 450 V
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