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State superposition for electrostatic fo...

State superposition for electrostatic force on a charge due to a number of charges.

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The principle of superposition states that total force on a given charge is the vector sum of the individual forces exerted on it by all other charges, the force between two charges being exerted in such a manner as if all other charges were absent.
`vec(F) = vec(F_(12)) + vec(F_(13)) + ...... + vec(F_(1N))`
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