# charge given to parallel conducting plates [duplicate]

Whenever a charge say $$Q_1$$ and $$Q_2$$ is given to identical conductors we have to assume that charge is given to their outer side and not inner side to calculate redistribution.

Why? I tried to find redistribution by not following above statement and it's true that I'm not able to get right answer but i just don't why?

Say $$Q_2$$ is negative the respective charges will lie on the inner surfaces of the conductors as the two opposite charges attract each other. Like so,