Three charges \( -q_{1}+Q_{1} \) and \( -q \) are placed at equal distances on a straight line. ...

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Three charges \( -q_{1}+Q_{1} \) and \( -q \) are placed at equal distances on a straight line. If the potential energy of the system of the three charges is zero, then what is the ratio of \( Q: q \) ?
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