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Three point charges are arranged on the line. Charge q1=+5nC and is at x=-4cm, charge q2=-3nC...

Three point charges are arranged on the line. Charge q1=+5nC and is at x=-4cm, charge q2=-3nC and is at x=4cm, charge q3 is at x=2cm. What is q3 (magnitude and sign) if the net force on q3 is zero.

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