A sphere has more surface area on its outer perimeter than near the center. While that sounds like an obvious statement it is important in understanding how ions travel with respect to a large mass. A mass of any size exhibits these principles.
Electrons nearer to the center of mass are more crowded and those at the periphery are more spread out. Electrons nearer the center will be accelerated outwards quickly and there will be a return current which is slower.
Electrons generally jump outwards while everything else gets pulled in the opposite direction in a drift force. This is why an apple falls towards the Earth and doesn't just float.
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