The photo in Figure Q20.1 shows a beam of electrons moving from right to left in a

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The photo in Figure Q20.1 shows a beam of electrons moving from right to left in a glass tube in which a vacuum has been established. This beam is deflected downward by a magnetic field. What is the direction of this magnetic field at the center of the tube? 


The photo in Figure Q20.1 shows a beam of electrons

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