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Phys Lab4 - Physics 263 Section 201 Electron Charge-to-Mass...

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Physics 263 – Section 201 Electron Charge-to-Mass Ratio Mohand Shalaby – G00572364 Partners: Vidal, Sharp. Instructor: R. W. Ellsworth
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Experiment done on: 22 nd of Feb 2010
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Physics 263 Mohand Shalaby Experiment – 4 Electron Charge-to-Mass Ratio 1. Introduction: In this experiment we are looking at the ratio of charge to mass of an electron em . A beam of electrons is accelerated by a potential difference and bent into a circular path by a magnetic field. The radius of the path is measured by the eye. We know the values of the electron’s charge and mass to be: e = 1.602x10 - 19 , m = 9.109x10 -31 . So em =1.7587 * 1011 For the magnetic field B we used the equation: B = 7.80x10 -4 I To verify this in our experiment we used the formula: em = 2VB 2 R 2 2. Apparatus: For this experiment we used the apparatus shown in Fig1:
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This is close-up of the controls Fig1: Diagram of apparatus. 3. Procedure: We connected the apparatus and took several measurements to find the required ratio. The beam of electrons is accelerated by a potential difference
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