Principle of superposition (electrostatic force) (F_net = Σ F_i (vector))
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F_net = Σ F_i (vector)
What each symbol means
| Symbol | What it stands for |
|---|---|
| \vec{F}_i | Force on test charge due to i-th source charge |
| \vec{F}_{\mathrm{net}} | Vector sum of pairwise Coulomb forces |
When to use this
Point charges; add as vectors. Works because Maxwell equations linear in vacuum.