2 1 Coulomb's law Given two stationary point charges @a and Qb, it is experimentally found that the force exerted by a on 1 aqb ab r 丌∈0 where ri is a unIt vector pointing in the direction trom Qa to Qb, and the permittivity of free space(vacuum) 0=8.85187817×10-12 farad/ meter Interpretation