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Unformatted text preview: ntial difference between two points, and not the potential V. This is because potential is like height – the location we choose to call “zero” is completely arbitrary. In this lab we will choose one location to call zero (the “ground”), and measure potentials relative to the potential at that location. APPARATUS 1. Conducting Paper Landscapes To get a better feeling for what equipotential curves look like and how they are related to electric field lines, we will measure sets of equipotential curves for several different potential landscapes. These landscapes are created on special paper (on which you can measure electric potentials) by fixing a potential difference between two conducting shapes on the paper. For reasons that we will discuss later, these conducting shapes are themselves equipotential surfaces, and their shape and relative position determines the electric field and potential everywhere in the landscape. One purpose of this lab is to develop an intuition for how this works. The two landscapes for which you will measure equipotentials are shown in Figure 1. (a) (b)
E01-2 Figure 2 Conducting Paper Landscapes. The two landscapes (a dipole and parallel plates) consist of two conductors which will be connected to the positive (red) and ground (blue) terminals of a battery. The pads are painted on conducting paper with a 1 cm grid. 2. Logger Pro Interface In this lab we will use the Logger Pro software and LabPro interface both to create the potential landscapes (by outputting a constant 4 V potential, much like a battery) and to measure the potential at various locations in that landscape using a voltage sensor. 3. Voltage Sensor In order to measure the potential as a function of position we will use the Vernier Differential Voltage probe, plugged into channel 1 of the Lab Pro interface. When recording the “potential,” you will really be measuring the potential difference between the two leads, (red minus black) and hence you should have the black lead connected to the out...
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