![]() The resultant electric field is a vector sum of the electric field due to individual charges. It is linear in $M$ and $m$ but not in $r$. law of superposition, a major principle of stratigraphy stating that within a sequence of layers of sedimentary rock, the oldest layer is at the base and that the layers are progressively younger with ascending order in the sequence. The principle of superposition states that when two or more waves meet at a point, the resultant displacement at that point is equal to the sum of the displacements of the individual waves at that point. The principle of superposition states that every charge in space creates an electric field at point independent of the presence of other charges in that medium. Then I could understand that derived quantities like the $E$ and $B$ fields would also obey it because, for instance: $$F_1 + F_2 = qE_1 + qE_2 = q(E_1+E_2) = F_$$ This law has $3$ independent variables. I assumed from my general physics courses that the principle of superposition was just an empirical fact about forces.
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