Physics - Physics
Lab: Electric Field  (attached below) P/s: Need to attach pictures when doing experiment. 1/3 Lab 2: Electric Field Objectives In this lab you will use PhET’s simulation Charges and Fields to study the electric field produced by discrete charge distributions. Part 1: Field Due to a Point Charge 1. Uncheck the box for Electric Field. 2. Check the boxes to display Values and the Grid. Make sure these are the only boxes checked. 3. Place a +1-nC charge toward the center of the simulation. 4. Distribute 8 sensors evenly around the point charge. Use the tape measure to place each sensor at a distance of 1 m from the point charge. All sensors should be the same distance from the point charge. For each sensor, the value in V/m is the magnitude of the electric field. Note that 1 V/m stands for 1 volt per meter, and 1 V/m = 1 N/C. The angle in degrees is the direction of the electric field relative to the +𝑥-direction, with positive angles being counterclockwise and negative angles being clockwise. Complete the following table by recording the magnitude of the electric field read by each sensor. 5. Based on your measurements, does the magnitude of the electric field depend on the direction of the field point relative to the point charge? 6. Place 7 of the 8 sensors back in their bin, keeping a single sensor in the simulation. 7. We now turn to investigate the dependence of the magnitude of the electric field on distance from the point charge. Use the tape measure to place the sensor at each of the distances shown in the table below and record the corresponding magnitude of the electric field. 8. Make a scatter plot of the magnitude of the electric field versus distance from the point charge. Plot electric field along the vertical axis and distance along the horizontal direction. Include the best-fit curve in your graph and the equation of the best-fit curve. Decide the type of curve to fit the data with based on theoretical expectation. Are your results consistent with theoretical expectation? 9. Place the sensor and the tape measure back in their respective bins. 10. Now check the box to display the Electric Field (not just its direction) and uncheck the Grid box. How is the magnitude of the electric field represented? Describe the global structure of the electric field (magnitude and direction) due to a positive point charge. 11. Use the simulation to compare and contrast the electric field of a single negative point charge to that of a single positive point charge. Sensor 1 2 3 4 5 6 7 8 Electric Field (N/C) Distance (m) 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 Electric Field (N/C) https://phet.colorado.edu/sims/html/charges-and-fields/latest/charges-and-fields_en.html 2/3 Part 2: Field Due to an Electric Dipole An electric dipole consists of a pair of equal and opposite charges. 1. Uncheck the box for Electric Field. 2. Check the boxes to display Values and the Grid. Make sure these are the only boxes checked. 3. Place a +1-nC charge and a −1-nC charge 2 meters apart along the horizontal. The positive charge should be to the left of the negative charge. Take the origin of the coordinate system to be at the midpoint of the two charges, with the 𝑥-axis directed to the right and the 𝑦-axis directed up. Let 𝑥 and 𝑦 denote the 𝑥 and 𝑦-coordinates of the field point, respectively. Let 𝐸 be the magnitude of the electric field, and 𝜃 the angle the electric field makes with the +𝑥- direction, with counterclockwise angles being positive and clockwise angles being negative. 4. Let us first investigate the electric field at field points on the horizontal line that passes through the two charges. This line coincides with the 𝑥-axis. Complete the following table. Use a sensor for the measured values. Also calculate the magnitude and direction of the electric field by adding the electric fields of each point charge. 5. In the above table, how do the measured values compare with the calculated values? 6. Let us now investigate the direction of the electric field at field points on the perpendicular bisector of the line segment that joins the two charges. This line coincides with the 𝑦-axis. Complete the following table. 7. In the table above, how do the measured values compare with the calculated values? 8. Now complete the following table. 9. In the table above, how do the measured values compare with the calculated values? 10. Place the sensor in its bin. 11. Check the box to display the Electric Field (not just its direction) and uncheck the Grid box. Describe the global structure of the electric field (magnitude and direction) due to an electric dipole. –2 –1.5 –0.5 0 0.5 1.5 2 Measured Calculated Measured Calculated x (m) E (N/C) θ (degrees) –2 –1 0 1 2 Measured Calculated Measured Calculated y (m) E (N/C) θ (degrees) –1 –1 1 2 –1 1 1 –1 Measured Calculated Measured Calculated x (m) E (N/C) θ (degrees) y (m) 3/3 Part 3: Field Due to a Pair of Positive Charges 1. Replace the charges in Part 2 with two +1-nC charges. 2. Repeat all the steps of Part 2 for this new pair of positive charges. 3. Compare and contrast the structure of the electric field of an electric dipole to that of a pair of positive charges. Part 4: Field Due to Three Nonlinear Charges 1. Place three point charges at locations of your choice. The three charges should not all have the same sign, and they should not be arranged along a straight line. Choose the origin of the coordinate system and use the same origin for both tables in this part. Indicate your chosen charges and their locations in the following table. 2. Measure and calculate the electric field (magnitude and direction) at three different field points of your choice. Complete the following table. 3. Compare your measured and calculated values in the table above. Charge (nC) x (m) y (m) First Charge Second Charge Third Charge Measured Calculated Measured Calculated y (m) E (N/C) θ (degrees) x (m) 1/2 Lab #: Lab Title (from the lab handout) Author: Your Full Name Date Performed: Month, Day, Year Class: PHYS ### Section: ##### Group Members: Full Name of Member 1 Full Name of Member 2 Full Name of Member 3 Full Name of Member 4 Abstract The abstract is one paragraph describing the ultimate purpose, methods used, and results of the lab work. From the abstract, the reader should be able to understand what the lab is intended to measure, what significant measurements were taken, and what summary results (including numbers) were obtained. It is not a detailed description, but a terse overview. Essentially you are to sum up the whole lab in one paragraph in this section. The abstract is not about anticipated activities, but an account of the experiments after they have been conducted. Theory This section of the report provides the theoretical context of the lab. Include theory that is relevant to the understanding of the lab experiments and the interpretation of the data. This section should look like a short encyclopedia entry on the topic of the lab and should include all the relevant equations (properly formatted). Use the textbook and other references to learn about the theory needed for the interpretation of your experimental results. Do not copy from the references or the handout; write in your own words instead. Do not provide a list of procedures that you followed and do not mention the results of the lab work or show calculations in this section. This is also not the place to include your thoughts about the lab or the results you obtained. Measurements and Observations This section includes a thorough description of the experimental setup(s), procedures followed, and the raw data (quantitative and qualitative) obtained from measurement and observation. Diagrams/snapshots of the experimental setup(s) should be included here. Do not include too many diagrams/snapshots; be judicious in your choices. Numerical data should be presented in tabular form when appropriate. Tables should not be broken over multiple pages. Data Analysis and Discussion All calculations related to the data and conclusions drawn from it should be outlined here, including calculations of percentage errors. For similar calculations, only include sample calculations. When appropriate or requested in the lab handout, include graphs of the data in this section. For all graphs, make sure you include titles, labeled axes with units, and the equations of curve-fits if they are used. 2/2 In addition to the quantitative conclusions, also include a discussion regarding the nature and the significance of the results obtained. What were your fundamental conclusions from the lab experiment(s)? Were there any surprises or were the results as expected from theory? If the lab did not work out as it seems it should have, this is the place to discuss it. Why do you think it did not work out? What were the causes? How might you avoid the same problems in the future? When addressing these questions, do not simply provide one-sentence answers like “There were no surprises.” A thorough discussion is expected here. The report must follow the above format and must be written in your own words, in complete sentences, and in paragraph form (not in list form). The report must be self-contained. This means that it should contain a thorough account of the experimental setup without need to refer to the lab handout. The lab report should also not read as if it is answering questions asked somewhere else. Do not copy from the lab handout and do not quote references. Write in your own words instead. Do not write the lab report as if you were asked (or forced) to carry out the lab activities. Use “we” instead of “I”. Do not use “student” or “students” to refer to yourself or your lab partners. Each section should contain multiple paragraphs of relevant content (except for the abstract which needs to be one paragraph). Avoid repetition and copying and pasting from one section into another. When including tables, graphs, and other figures, also include explanatory text to accompany these elements. Do not group tables, graphs, and other figures together; they should be integrated with the text and included where they need to be included. Also pay close attention to the formatting of the lab report, including typography, margins, spacing, and overall look. Finally, make sure the report is free of typos and grammatical errors. The lab report must be submitted on Canvas as one Word document (integrating all the tables, graphs, and other figures). As a SAC student, you have free access to Microsoft Office 365, which includes Word and Excel. The lab reports will be graded using a rubric. Make sure you read the rubric carefully for any additional requirements. https://rsccd.edu/Departments/Information-Technology-Services/Pages/Student-Email-Cloud.aspx
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