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Submission + - Physicists Turn Pull into Push->

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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What is algebra, exactly? Is it one of those three-cornered things? -- J.M. Barrie

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