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After being accelerated to a speed of 1.11x10 m/s, the particle enters a uniform magnetic field of strength 0.700 T


J.J. Thomson is best known for his discoveries about the nature of cathode rays. His other important contribution was the invention, together with one of his students, of the mass spectrometer, a device that measures the ratio of mass m to positive) charge q of an ion. 

The spectrometer consists of two regions as shown in the figure. (Figure 1) In the first region an electric field accelerates the ion and in the second the ion follows a circular are in a magnetic field. The radius of curvature of the arc can be measured and then the m/q ratio can be found. 

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After being accelerated to a speed of 1.11x10 m/s, the particle enters a uniform magnetic field of strength 0.700 T and travel in a circle of radius 350 cm determined by observing where it hits the screen as shown in the figure. The results of this experiment low one to find m Find the ratio m/q.  

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