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Two small balls of masses 3m and 2m and each having charges Q are connected by a string passing over a fixed pulley. Calculate the acceleration of the balls (in `m//sec^(2)`) if the whole assembly is located in a uniform electric field `E=(mg)/(2Q)` acting vertically downwards. Neglect any interaction between the balls. Take `g= 10 m//s^(2)`

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