7.2 x 10-7 N attraction 2.1 x 10-7 N repulsion A on B / B on A

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7.2 x 10-7 N attraction 2.1 x 10-7 N repulsion A on B / B on A qA = - 4 x 10-9 C qB = 5 x 10-9 C d = 0.5 m k = 9 x 109 7.2 x 10-7 N attraction F = ? N B on C / C on B qB = 5 x 10-9 C qC = 3 x 10-9 C d = 0.8 m k = 9 x 109 F = ? N 2.1 x 10-7 N repulsion

6.4 x 10-8 N attraction charge A . . . . ΣF = 7.84 x 10-7 N right A on C / C on A qA = -4 x 10-9 C qC = 3 x 10-9 C d = 1.3 m (0.5 + 0.8) k = 9 x 109 F = ? N 6.4 x 10-8 N attraction 1) charge A . . . . ΣF = 7.84 x 10-7 N right charge B . . . . ΣF = 9.3 x 10-7 N left charge C . . . . ΣF = 1.46 x 10-7 N right 2) charge B . . ΣF = 1.66 x 10-4 N @ 74.3° above the x-axis