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Download 3 Simultaneous Magnetic and Electric Fields
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Charged Particles Moving in Simultaneous Electric and Magnetic Fields Mrs. Coyle AP Physics C Charged Particles Moving in Electric and Magnetic Fields • Net force is the sum of the electric and magnetic force F = qE + qv x B Velocity Selector: an instrument that allows particles of a certain speed to move through. • It contains a uniform electric field that is perpendicular to a uniform magnetic field. Velocity Selector When net force=0 F = qE + qv x B =0 qE = qv x B v=E/B An entering particle of this speed will continue moving straight across the plates. If the particle has a different speed, then the magnetic force will be different and the net force will not be zero. Mass Spectrometer m rBo B q E Thomson’s Experiment found the ratio of charge to mass of the electron #40 #41 #59 #57 #60