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Pushme-Pullyou

Can anyone tell me what it is that does the pushing in the simple sleeve test, where one rubs a plastic tube and is able to pick up bits of paper?

I look at this in the sense that there is no pull, only push. Please tell me, what is doing the pushing? This is also true of magnets. Where does the push come from in both the attraction mode and the repulsion mode?

John Shallcross, Johnsonville