Let there be a system of $n$ source charges and a test charge $Q$. When we say superposition applies to electrostatic force, we conclude that the interaction between a given source charge and the test charge is independent of interaction between other source charges and the test charge. Why exactly it is the case? Also why some forces follow superposition?
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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?
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