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Unformatted text preview: ct” button (alternatively, the space bar) to begin recording the potential of the red lead (relative to the black lead=ground). See below. E01-4 Figure 3: Voltage Probes. An example of voltage probe placement. Note that this is much easier with several people working together! 5. Measure the potential of both conducting pads to confirm that they are properly connected (one should be at +4 V, the other at 0 V), and that they are indeed equipotential objects (we will explain why next week). 6. Now, try to find some location on the paper that is at about +1 V (don’t worry about being too
precise). Hold the lead steadily in the location you intend to measure, as the voltage varies with movement. Mark this point on the plot on the next page. Do NOT write on the conducting paper!
7. Find another 1 V point, several centimeters away. Continue until you have closed the curve or left the page. As you go along, sketch and label the points on this equipotential curve on the top drawing on the next page. Do NOT write on the conducting paper! 8. Repeat this process to find equipotentials at 2 V, and 3 V. Work pretty fast; it’s more important to think about what these lines mean than it is to draw them perfectly. Think about what you are doing – are there symmetries that you can exploit to make this task easier? Figure 3: Measuring Potential. An example of measuring equipotential lines, here the potential was measured increasingly far away from one of the conducting pads. Note that accurate measurement requires holding the lead of the voltage probe at a constant position for up to several seconds. E01-5 Experiment 1: Equipotential Lines and Electric Fields
Table/Group ______ Names ____________________________________ ____________________________________ ____________________________________ E01-6 Question 1: After you have finished with sketching the three equipotential lines on the top drawing on the previous page, sketch in a set of electric field lines (~ six) on your plot of equipotentials on the previous page. Do NOT write on the conducting...
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