Experiment 3 - em of an Electron

Experiment 3 - em of an Electron - e/m of the Electron...

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e/m of the Electron Experiment #3 Jae Chung 10/15/2007
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Introduction: For this lab, we are trying to measure the charge to mass ratio of an electron by using Helmholtz coils and taking advantage of the electron’s circular trajectories in uniform magnetic fields. By adjusting the voltage of our apparatus, we could manipulate the field strength and obtain a set of data. The unweighted mean of the charge to mass ratio, e/m came out to (-2.123 ± 0.0159) x 10 11 C/kg while the weighted mean came out to (-2.097 ± 0.0136) x 10 11 C/kg Our results were slightly higher than the CODATA (Committee on Data for Science and Technology) value of -1.759 x 10 11 C/kg. Procedure: Upon starting the lab, we found that the dip needle was unable to adjust to the Helmholtz coils, so the axes were not parallel to the Earth’s magnetic field. We minimized the effects of the heated filament current on the electron beam by aligning the apparatus such that the electron beam is parallel to the coils. Next, we set the voltage to 20±0.5V and adjusted the current until the outer edge of the electron beam hit
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This lab report was uploaded on 04/07/2008 for the course PHYS 1493 taught by Professor Lab during the Fall '08 term at Columbia.

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Experiment 3 - em of an Electron - e/m of the Electron...

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