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If we place two charges, q1 = 15 mC at (x, y) = (4 cm, 0...

If we place two charges, q1 = 15 mC at (x, y) = (4 cm, 0 cm) and q2 = 5 mC at (0 cm, 2 cm),
where must we put a charge q3 = −9 mC in order for any charge placed at the origin to be
still.

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