# Lab 2 - The second piece of paper was similar except it also had a large silver circle in between the two bars This time the entire grid’s

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Jody Lewin Lab Partner: TA: Laxman Mainali Lab 2: Electric Potential 8 February 2008 To set up the lab, a plate was hooked up to a volt meter and power supply to run current through the plate. The voltage was set to 5 volts, and the power supply conducted electricity through black resistive paper with silver paint. The multimeter, which is used to measure voltage, was set to the 20 volt scale. There were two parts to the lab, each involving a different resistive paper. The first black resistive paper had two bars drawn on with silver paint, one upper and the other lower. There were small silver dots evenly spaced on the paper creating a grid. We used the voltage reader to record the voltage along the center, and then along the left ends of the two silver bars. These values were recorded in Excel, and a graph was created with a best fit line in order to measure the slope. The electric field is equal to the change in voltage divided by the change in position of the charge that was measured.
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Unformatted text preview: The second piece of paper was similar, except it also had a large silver circle in between the two bars. This time, the entire grid’s voltage was measured including the points in the circle. This data was recorded in Excel, and two graphs created showing the voltage changes represented in both 2D and 3D. The one in 2D was drawn on, illustrating electric field lines, which lie perpendicular to the constant potential lines. The slope value for the first graph, along the center, is 0.4369, and the slope of the graph of the left ends was 0.3795. These values represent the magnitudes of the electric fields. There are a few sources of slight error. The inconsistency of the silver paint on the paper could contribute to slight variations. There were a few places where the silver paint had chipped off, forcing the reading to be moved slightly. Overall, the results seem pretty accurate....
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## This lab report was uploaded on 04/16/2008 for the course APHY 151 taught by Professor Lanford during the Spring '08 term at SUNY Albany.

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