formula_4 and formula_5 are the scales of each electric charge. formula_6 is the distance between the two electric charges. And formula_7 has a certain value. It does not change relative to formula_4, formula_5 or formula_6. While formula_11 remains constant, when multiples of formula_4 and formula_5 become bigger, the electrostatic force will also get bigger. When the distance formula_6 becomes bigger, the electrostatic force will become smaller by the ratio of formula_3.