Superposition Principle: The principle is based on the property that the
forces with which two charges attract or repel each other are not
affected by the presence of a third (or more) additional charge(s) For
an assembly of charges q1, q2, q3, , the force on any charge, say q1, is
the vector sum of the force on  q1 due to q2, the force on q1 due to q3,
and so on For each pair, the force is given by the Coulomb’s law for
two charges stated earlier