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Two uniform non conducting balls A and B...

Two uniform non conducting balls `A and B` have identical size having radius `R` but made of different density material (density of A = 2 density of B). The ball `A is + vely` charged and ball `B` is - vely charged. The balls are released on the horizontal smooth surface at the separation `10 R` as shown in figure. because of mutual attraction the balls start moving towards each other. They will collide at a point.
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