well,i think that f1=f2,maybe.f1 calculates the force between 2 charges(q,Q),and f2 calculates the force needed to move (q) for a distance (r),and that force comes from a power source,which is a battery.
any battery have anod,and cathod,which are basically ions.
ions are an atom that gained-lost electrons during a chemical reaction.
so they are basically charges.

R=Kt/r.........if it was correct,it would give the resistance of a conductor ,with knowing the time that a(q) took to cross it,and knowing the distance.

anyway,i will be 16 next monday,so im still young,and i could be wrong. ;)
thx for the help