  It is conventionally believed that solutions of so called "free" Maxwell
equations for \varrho=0 (density of charge) describe the free electromagnetic
field in empty space (if one considers the free field as a field, whose flux
lines neither begin nor end in a charge). We consider three types of regions:
(i) "isolated charge-free" region (where all electric fields, generated by
charges outside that particular region, are zero), for example, inside a hollow
conductor of any shape or in a free-charge Universe; (ii) ``non-isolated
charge-free" region (where all electric fields, generated by charges outside
that particular region, are not zero) and (iii) "charge-neutral" region (where
point charges exist but their algebraic sum is zero). The paper notes that
there are two families of solutions: (1) In "isolated charge-free" regions
electric free field does not exist in the context of Maxwell's equations, but
there may exist a time-independent background magnetic field. (2) In both
"charge-neutral" and "non-isolated charge-free" regions where the homogeneous
condition \varrho=0 also holds, Maxwell's equation for electric field have
non-zero solution, as in the conventional view, but this solution is not free
field. We mention some implications related to free-electromagnetic fields and
the simplest charge-neutral universe.
