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Two Point Charges (Q , 9Q) Are Placed So That The Distance Between Them Is (1 M). - Math Discussion

Two point charges (Q , 9Q) are placed so that the distance between them is (1 m).

Two point charges (Q , 9Q) are placed so that the distance between them is (1 m). Find the sign, the position and the magnitude of a third charge (q) so that the whole group is in equilibrium.