Solution: Two small beads having charges q1 = +9Q and q2 = -Q are fixed on a horizontal insulating rod. The distance between q1 and q2 is d = 1.5 m  The third bead with charge q 3 = +Q is at the right hand side

Two small beads having charges q₁ = +9Q and q₂ = -Q are fixed on a horizontal insulating rod. The distance between q₁ and q₂ is d = 1.5 m  The third bead with charge q ₃ = +Q is at the right hand side of the second bead and is free to slide along the axis of the rod. At what position x is the third bead in equilibrium?