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The purpose of this lab was to get an introduction to mapping electric fields. In other words, the electric field is the surrounding charges which create an electric field around a given point.
The easiest way to think of an electric field mapping is by the analogy of a topographical maps.
Then the lines are drawn in areas with equal voltage to the reference points. This also means you are staying at zero potential energy, with no work being done. For our experiment we used a power supply to provide a constant voltage between to conductors, this was connected to a plate which contained a chain of resistors.
The resistors were connected to terminals of a power supply and each resister cut the amount of power suppled to the next by one. So at the first resister, if the supply was giving 8 volts, there would be the full 8 volts.
The next resister would have 7 volts, the next would have 6, and so on. On the board the resisters were on we attached another board which had electrodes and contained graphite and conducting paint.
For our lab, we experiment with three different kinds of these boards, each having a different configuration of electrodes. We placed a two-point charge plate on the underside of the board and then flipped the board over.
We placed a white piece of paper under the four legs and secured it with masking tape. The power supply was then connected to the board and set at 8.
A probe was connected to a galvanometer and the probed was placed so the board was between each stick of the probe.
The volt supply was placed in the middle conductor at 4 volts.
The probe was moved around the board to various points and anytime the galvanometer read zero, a point was marked there. Once all the points were found then the power supply was located to another conductor and the same process was preformed.
After all the null points were found a curved was drawn between them. This was done two more times for two other charge plates. All the null lines are in black and the equipotential lines are the colored lines.
Figure 1 shows what the electrode plates look like which were attached to the board. Figure 1 Figure 2 is our result for plate 1.
Plate one Figure 3 is the result for plate 2 with the parallel electrodes. Figure 3 Figure 4 is the results from our "random" plate 3. Our maps of the electric fields turned out moderately well.
The point-charge field apparently is strongest around the electrodes. The closer together the electric field lines come together, the stronger the electric field is.
As you move away from the charge, the electric field lines get more spread out, the electric field is weaker farther away. Plates 1 and 2 came out very clearly and the drawing of the equipotential lines were easy.
Plate three was less clear in its results and the drawing of its equipotential lines was not easily done. After drawing the maps it is clear why electric field mapping is similar and can be analogous with topographic maps.
Like the topographical maps, this where there is the same height or the same electric field strength. No work is being done in this area, but if you move off those lines, then work will be done as either negative or positive.
Just like if you were to follow the lines on a topographical map, you are moving at the same elevation and not going up hill or down hill so not work is being done.
The potential energy stays the same as you move along the lines at the same height. While we were working on the experiment we found two possible sources that might cause random error.
One was how the galvanometer was read. With partners taking turns and being at different angles, where the meter read zero might be different depending on where the person was and how they read it.
Another source might have been the galvanometer, which might have been calibrated perfectly and when it read zero it might really be reading to the negative or positive sides instead of being right on.
There were also two possible sources of systematic error that occurred during our experiment. One was the interference of the metal in the table. This may have caused our mapping to be slightly off.Type or paste a DOI name into the text box.
Click Go. Your browser will take you to a Web page (URL) associated with that DOI name. Send questions or comments to doi. The Columbia University Statistical Laboratory (location unknown) includes Hollerith tabulating, punching, and sorting machines, Burroughs adding machines, Brunsviga and Millionaire calculators (the latter was the first device to perform direct multiplication), plus reference works such as math and statistical tables.
Prof. Robert E. Chaddock (Statistics Dept) was in charge. Equipotential and Electric Field Mapping Objectives 1. Determine the lines of constant electric potential for two simple con- In case you don’t remember your Physics II lecture material, you’ll need to In today’s lab lines run along the side of the hill, and the electric ﬁeld lines run down the hill, they are always.
The Ig Nobel Prizes were awarded on Thursday night, September 22, at the 26th First Annual Ig Nobel Prize Ceremony, at Harvard's Sanders monstermanfilm.com ceremony was webcast.. REPRODUCTION PRIZE [EGYPT] — The late Ahmed Shafik, for studying the effects of wearing polyester, cotton, or wool trousers on the sex life of rats, and for conducting similar tests with human males.
Electric Field Mapping. Objectives: 1) To learn the concepts of electric field lines and equipotentials, and. 2) use the equipotential lines for drawing the electric field lines. Equipment: This experiment, exceptionally, does not require a formal lab report. You will instead follow the experimental procedure and will be asked to draw the.
Lidar (also called LIDAR, LiDAR, and LADAR) is a surveying method that measures distance to a target by illuminating the target with pulsed laser light and measuring the reflected pulses with a sensor.
Differences in laser return times and wavelengths can then be used to make digital 3-D representations of the target. The name lidar, now used as an acronym of light detection and ranging.