What is the principle of superposition?

The forces of interaction F12, F13, …, F1n of the charge q1 with each of the charges q2, q3, …, qn are determined by the Coulomb law, and the resulting interaction force F1 is the geometric sum of the vectors of the forces of interaction of the charge q1 with each of these charges F1 = F12 + F13 + … + F1n.

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