For
example, the total charge of a system containing five charges +1, +2, –3,
+4 and –5, in some arbitrary unit, is (+1) + (+2) + (–3) + (+4) + (–5) = –1 in
the same unit 1 4 2  Charge is conserved
We have already  hinted to the fact that when bodies are charged by
rubbing, there is transfer of electrons from one body to the other; no new
charges are either created or destroyed