Chapter-1|Electric Charges and Fields | NCERT 12th Physics:
Forces Between Multiple of Charges:(Superposition Principle):-
It state that when a number of charges are interacting, the total force on a given charge is the vector sum of the forces exerted on it due to all other charges. The force between two charges is not affected by the presence of other charges.
Let a system of N point charges q₁, q₂, q₃,…… qₙ placed in a vacuum whose position vector with respect to origin O are r₁, r₂, r₃,……… rₙ.
According to principle of superposition the total force on charge q₁ is given by