Two fixed, equal, positive charges, each of magnitude 5×10-5 C are located at point A and B separated by a distance 6 m. An equal and opposite charge moves towards them along the line COD, the perpendicular bisector of the line AB. The moving charge, when it reaches the point C at a distance 4m from O, has a kinetic energy of 4 joules. The farthest point D from O which the negative charge will reach before returning towards C is
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