= Electric force
{title2=$\mathbf F_E=q\mathbf E$}
The <electric force> on an <electric charge> $q$ is $\mathbf F_E=q\mathbf E$, using the <electric field> of the other sources and excluding the charge's own self-field. Positive <electric charge> gives <force> along the <electric field>; negative <electric charge> reverses it. A field $\mathbf E=400\,\mathrm{N/C}\,\widehat{\mathbf x}$ therefore gives $\mathbf F_E=-8\times10^{-7}\,\mathrm N\,\widehat{\mathbf x}$ on $q=-2\,\mathrm{nC}$. This is the electric part of the <Lorentz force>; the magnetic contribution is $q\mathbf v\times\mathbf B$. https://openstax.org/books/university-physics-volume-2/pages/5-4-electric-field[OpenStax, University Physics II, §5.4: electric field and force]{ref}.
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