on chargin the body by fric ...e transfer from one to othe,...if the body from which e go is not insulator...and is a conductor.. it will again take bake the e and there wont be chargin at all.. hope u got it....
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because if the other sphere (or body) is not insulator then the electrons will happily pass through them and via the conduction wire reach the earth ..... so if the other material is an insulator then there will b very less flow of electrons and so we can then charge it by induction ...
the electrons won`t stay at one place...the conductor has metal atoms with electrons flowing freely..so if both are condustors..the electrons will not transfer