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Master
Equation solution 17 : r_{34}² = k * (Q_3 * Q_4)/r_{34}² devient r_{34}² = k * (Q_3 * Q_4)/F
Equation solution 17 : r_{34}² = k * (Q_3 * Q_4)/r_{34}² devient r_{34}² = k * (Q_3 * Q_4)/F