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Submission + - Physicists Turn Pull into Push (sciencemag.org)

sciencehabit writes: It's textbook physics: An electric charge near the surface of a material gets pulled toward the surface. However, if the charge is spread out into the right shape and moves fast enough, that attraction becomes a repulsion, one physicist calculates. The odd finding could help physicists avoid unexpected effects when guiding beams of particles such as electrons.
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Physicists Turn Pull into Push

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If you're not careful, you're going to catch something.