????? ??? ???? ?????? ( ???????? ??????? ) ???? ????? ? ????? ???????? ??????? ?? ???. ?? ?? ?? ?? ???????? ?????? ?????????? ?? ?????? ???????? ???? ? ???? ???????????? ??????? ?? ???.[?][?]Demand on a gold-leaf electroscope brings about the leaves to visibly repel each other By modern-day Conference, the demand carried by electrons is defined as