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Three positively charged particles of negligible mass lie on a straight line. Their charges are equal to q with positions 0,x,r respectively. Charges at position

Three positively charged particles of negligible mass lie on a straight line. Their charges are equal to q with positions 0,x,r respectively. Charges at position 0,r are fixed and charge at x is movable. If the charge at position x is displaced slightly along the axis from its equilibrium position. Find:

(a) Equilibrium position

(b) restoring force

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