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[–] 2223993? 0 points 1 point (+1|-0) ago 

It is basically simple.

Same sign charges hate each other and repel the others. In electronics, the electrons move so electrons hate other electrons and wants to be as far as possible from the others. (electric charge repelling each other).

Now electrons can only move along the wire, unless you overcharge the wire then you get an arch.

When you put a battery on the wire then all electrons are forced one way. No matter how much they hate each other, the voltage pushes them together to one plate until they cant go any further. However the charge (yelling) of the other electrons is heard by the electrons at the other plate and in terror they start to flee away from the plate. When electrons run away screaming, that plate has a lack of electrons and thus becomes more positive charged.