PHY1105_L08_MappingElectricFields_JElyWasinger

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School

Front Range Community College *

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1105

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Electrical Engineering

Date

Dec 6, 2023

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docx

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Uploaded by CountAlligator3653

Lab07: Mapping Electric Fields Objectives 1) Learn how to use a multimeter to measure voltage and resistance. 2) Learn how to use the Electric Field Measurement Apparatus. 3) Draw equipotential lines based on a series of conductors. 4) Identify the relationship between conductors, equipotential lines, and electric field lines. Materials -Multimeter -E-Field Measurement Apparatus -Power Supply -Mapping Paper -Other materials as necessary Tentative Procedure The main goal of this lab is to calculate through experimental measurements the relationship between electric force and the accumulated charge on two balloons. Will be learning how to use the experimental setup together. A rough setup procedure is provided below to guide us on our adventure. We may make adjustments to the procedure as we go. I’ve also uploaded to MyCourses the instructions for the Overbeck Apparatus, which will also be helpful. The purpose of this experiment is to map out the electric field around a conductor. The conductors are on thin sheets used in the E-field Measurement Apparatus. -Remove the two screws on the bottom apparatus (each screw should have an attached nut). -Create terminals on your conductor sheets by attaching these screws to the conductor sheet. (Make sure that the screws are securely attached). -Hook up the negative battery terminal to one side of the conductor sheet and the positive battery terminal to the other side. -Using the multimeter set on voltage measure the voltage at different locations on the conductor sheet. Record these values on your mapping paper. Try to find the location of equipotential lines (lines of constant voltage). -Map out the entire conductor sheet recording the voltage readings on the mapping paper. Draw the equipotential lines on your mapping paper. Draw the electric field lines (these should be perpendicular to the equipotential lines).

Deliverables 1. Map out two conductor sheets (time-permitting) on your conducting paper. Capacitor Dipole

2. A discussion of how the arrangement of the conductors on the conductor sheet corresponds to what you drew on your paper. The dipole conductor sheet had much more spread-out voltage lines than the Capacitor plate. The Capacitor plate had more conductive material for the current to pass through, therefore allowing a stronger magnetic current to flow through the plate, whereas the dipole plate had limited material to allow a magnetic flux. 3. A brief procedure (especially parts that differ from the procedure described above). We first attached the conductor sheet to the bottom of the apparatus with the attached screws, then placed a sheet of paper on top of the apparatus, securing it with tape so it did not move while we measured the magnetic fields. We then attached the power supply and the measurement node, wiring in the multimeter to allow for a voltage reading. We then turned on the power supply and measured and marked the lines where the voltage was consistent on the plates. After measuring the voltage in 2V increments, we swapped out the conductor plate for the dipole plate and repeated the experiment for the second plate. After recording the voltages, we attached the points to create the equipotential lines, then sketched in the electric field lines perpendicular to those. 4. An explanation of how the experiment works (i.e., explain it as though you were teaching this experiment to a friend who had never seen it before. By attaching the power supply to the apparatus, we are creating an electric field. Because we have a positive and negative terminal, a difference in

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electric potential occurs across the apparatus due to the change in distance. With the node, we are able to measure the electric potential across the apparatus. The lines where the voltage is consistent measure where the electric potential is consistent, therefore, that’s where the electric potential is at a constant. From those lines, we can sketch the electric field, as we know where the voltage is the same, and where the two poles are located.

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