, 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 8 The electric field E at a point due to a charge configuration is the
force on a small positive test charge q placed at the point divided by
the magnitude of the charge