Wendler_K_152_lab2_

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University of Southern California *

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152

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Physics

Date

Dec 6, 2023

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pdf

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3

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Karsyn Wendler Physics 152- Lab Section: Wednesday 2:00pm Lab #02- Electric Potential and Electric Fields September 6, 2023 INTRODUCTION In this experiment, my lab partner and I will use plate capacitors, a mapping board, voltmeter and probe to map and visually understand the relationship of electric potential and electric fields between two electrodes. We will test this with two different plate capacitor patterns to visualize the way that electrode shape can alter this electric potential/electric field relationship. PARTS A, B, and C: For the first part of this lab, we will trace the electric potential voltage on a parallel plate capacitor. We begin by setting up the mapping board with the metal parallel pattern plate on the bottom, and a sheet of paper with the pattern traced onto it on top. We then connect the set up to the DC power supply, voltmeter, and probe to create current flow, read voltage and map the data respectively. This set up is seen here: With 10-volts of electricity from the power supply, and the voltmeter reading up to 20- volts, we can begin moving the probe around to find approximately 6-8 locations on the plate that read 8 volts on the voltmeter. We used a red colored pen to make these markings and connect them with an approximate line. The same process was done for electric potential readings of 5-volts (blue pen) and 2-volts (orange pen). Finally, we sketched electric field vectors (in black pen) over our mapped data. These electric field vectors, E, were easy to approximate atop our measured electric potential lines, V, as they always intersect at a right angle. The final collection of data is depicted in the following picture:
PARTS D and E: For the next part of the lab, we followed the same mapping board set up as prior, except we are using a different capacitor pattern: the “ice-pail” capacitor pattern. With this new pattern attached to the underside of the board and traced onto a sheet of paper we can ensure everything else set up the exact same as before and begin using the probe to read for specific electric potentials. This time, we used to probe to find locations of electric potential with voltage readings of 3-volts (orange pen), 5-volts (blue pen), 7-volts (pink pen), 8-volts (green pen), 9- volts (purple pen), and 10-volts (red pen). Again, points of corresponding color were connected to create a contour line for each voltage reading. And lastly, we mapped out E, the electric field vectors (black pen) approximately 90-degrees to each electric potential line. The data described is depicted in the drawing below:
PARTS F and G: Based upon the data collected in Parts D&E, we know that the electric field is the most strong next to the outstretched ‘walls/prongs’ of the ‘ice-pail’ shape because the electric potential lines are much closer together in this area than any other. Additionally, we know that the magnitude of the electric field is the least strong near the ‘dot’ (especially above/below and behind it) because the electric potential lines in this area are the most spread out. Coincidentally, this data also informs us that the strongest electric field is usually observed the area where the electric field lines are the shortest and most direct (straight or almost straight) between the two electrodes.
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