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Lab questions

This lab report examines the electric field around a conductor using conductive paper. The student sketches the electric field lines and equipotential lines for two point charges and a parallel plate configuration. Most results support the predictions, though some lines are not perpendicular, possibly due to static charge on the paper or interference from the pencil. The density of equipotential lines, electric field lines, and electric field strength are related - as one increases, so do the others. Introducing a hand near the paper would ground it, altering measurements. The introduction outlines measuring electric fields and equipotentials, while the conclusion notes that objectives were met but with some mechanical errors.

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66 - 8 of 8 © 2004 PASCO Lab Report: Electric Field Around a Conductor Name:__________________________________________________________ Analysis Questions 1. Using the blank copy of the conductive paper included, sketch each configuration (2 unlikepoint charges & parallel plate configuration) and show the electric field lines and theequipotential lines. 2. Do your results support your predictions? If not, explain possible sources of error. Results support predictions if field lines are perpendicular to equipotential lines. In the experiment, most field lines were perpendicular to equipotentials, although some were not. This could have been accounted to the paper having a static charge, by rubbing with the cork, or lead from pencil could also interfere with the charges. 3. What is the relationship between the density of the equipotential lines, the density of the electric field lines and the strength of the electric field? -Density of equipotentials, electric field lines, and strength of the electric field have various relationships. One of them is that the more charges, the more lines. The denser the electric field lines are, the stronger the electric field. -If equipotential lines are bunched together in one spor, electric potential has a greater rate of change; therefore the electric field is stronger. - If electric field lines are close, density of equipotential lines will be close as well, as one increase, the other increases. As density of one increase, density of the other does too. 4. What would happen if you place your hand on the conductive paper while taking a Measurement? Does it affect the measurement? Why or why not? If someone places his/her hand on the conductive paper, while taking a measurement, the hand will serve as a path for charges to go, “grounding.” This would introduce a new charge to the equipment. 5. Engineers: In the background it is shown that the equation for the electrical field is . Using dimensional analysis, show that N/C equals V/m for the electrical field.
Introduction In “Electric field around a conductor lab” the main objective is to determine the magnitude, and the shape of electric field, as well as equipotentials around two point charges, and around a parallel plate. This is achieved with conductive paper, which will allow determining charge at any point in the page. An electric field is created when an electron and a proton are in the same conductor. This electric field will have a force, which will lie in lines connecting them. Equipotential lines, which go from one charge to another, have the same electric potential along the line, and describe the surface on which the electric field has a constant value. Electric field lines, which surround a charge since they have the same charge magnitude along the line, provide a way to visualize field. Electric field lines, showing the direction of the and the magnitude of a field, point in the direction where the voltage increases the fastest, therefore lines of constant voltage (equipotentials) would be perpendicular to electric field lines.
Conclusion The experiment was satisfactorily conducted, but values were not as exact due to mechanical error. Predictions were accurate, equipotential lines have a constant voltage, go from one charge to another, and are perpendicular to electric field, (which surround a charge) lines in an accurate experiment, with accurate data. Most of the lines in our data show to be perpendicular, but some are not. This is to be accounted for several possible errors. Bias could have been caused by errors such as; a static force created on the conductive paper by rubbing with the cork, by the lead on the pencil interfering with charges, by accidentally grounding, or by the paper not being sufficiently conductive. In longer laboratory reports, a "Conclusion" section often appears. Whereas the "Results and Discussion" section has discussed the results individually, the "Conclusion" section discusses the results in the context of the entire experiment. Usually, the objectives mentioned in the "Introduction" are examined to determined whether the experiment succeeded. If the objectives were not met, you should analyze why the results were not as predicted. Note that in shorter reports or in reports where "Discussion" is a separate section from "Results," you often do not have a "Conclusion" section. (See a