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美国宇航局飞进纳米比亚的云实验室

Eric Hand

    Science (New York, N.Y.)
    |August 27, 2016
    PubMed
    概括

    No abstract available in PubMed .

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    Thomson's e/m Experiment01:19

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    In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
    A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...