181L_Lab_10-1

# For a constant current i plot a graph of voltage v as

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For a constant current (I), plot a graph of voltage V as a function of r 2 . Obtain the slope of this curve. Slope: 2) For a constant voltage (V), plot a graph of I 2 as a function of (1/r) 2 . Obtain the slope of this curve. Slope: 3) Determine the value of the ratio of e/m from each of the curves that you plotted. For constant I: For constant V: 4) Compare the average of the values of e/m obtained with the accepted value. Average e/m: Accepted value for e/m: Percentage error: Results/Conclusion After the completion of this experiment, the e/m values were calculated within a reasonable percentage error of ~12.7%. The experiment was a success overall, proving the validity of the given equations and demonstrating the relationship between variables like voltage or current in the measurement of e/m. The error that was present can be attributed to a few simple causes. First and foremost, human error, plain and simple, played a role. The instruments used to take the radius measurements were labeled in large intervals of 1 cm at a time, making getting an accurate reading difficult. Additionally, the lighting in the room wasn’t always conducive to deriving accurate results. Despite these flaws, the experiment is sound in design and execution and led to some relatively precise results. [1]. Physics Department at UNR, Lab Manual 10: e/m Apparatus EM-1N. 11/30/11, 11/8/11. < ;
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