Module 9: Induced Currents, Lenz's Law
In this lab, you will complete three activities to investigate how to generate an induced current in a loop. The IOLab will be used as a voltmeter to measure the potential difference between the two ends of a very long wire wound into a tight coil. Any currents induced in the coil will establish a potential difference that can be measured with the High Gain sensor on the IOLab. Note: The units for this measurement of voltage are mV, so we're exploring small potential differences across very large lengths of a wire.
You will need some additional materials to complete the lab that are not included in the lab materials kit. See the list of materials below for details.
Objectives
In this experiment, you will investigate the emfs and currents created in a circuit by a changing magnetic flux passing through a coil.
Read the Lab Document Download Lab Document
The lab instructions includes some new physics that is not discussed in the textbook for relationships between a rotating magnet and the oscillation frequency for an induced emf in a nearby loop.
Download the IOLab Lesson File Download Lesson File
The three activities are presented as a series of slides in a lesson file. Download the lesson file and follow the directions below for opening the file. You will answer embedded questions and submit this file for evaluation.
Lab Set Up and Data Collection
Lab Materials and Setup Videos -
Lab Materials
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Setup Videos |
Using IOLab Lesson Player
After you download the lesson and place it in the correct folder on your computer, follow these directions to access the first IOLab Lesson:
- Open the IO Lab Program.
- Click the folder icon on the toolbar.
- Select "Lesson List" to reveal the available lessons.
- Choose Lab9-MagneticInduction which opens the lesson to the first slide.
- Complete the directions on each slide and click Save & Next Slide to move through the lesson.
- View the important tips below to inform you of some quirks with the lesson player. It may affect how you work through this lab.
- Lab reports are automatically generated as you work through each lesson. Instructions for accessing these reports are below as well.
Important Tips for Operating the Lesson Player
Once you are in the Lesson Player, keep in mind the following tips:
- Make sure your IOLab cart is connected and maintains communication with the computer. Any issues with losing a connection during a collection of data may cause the lesson player to crash or lose some functionality.
- As the batteries weaken, the cart may shut off for no apparent reason. If this happens, replace the batteries using the multitool provided in the lab supplies and begin a new lab report (hit Restart button).
- If your lesson crashes, restart the lesson from the beginning slide. Do not try to access any previously stored lesson data from the crashed session.
- It may help to delete data stored from lessons where the player crashed. Delete data reports by clicking the trash can beside the report you want to remove. This is done at the same place where you can rename or export saved lab reports (see below).
- You can always return to previously completed slides in the lesson player, but be forewarned to not change any of the data acquisitions on slides that were already saved. Once you save a slide, you should consider the data on that slide as frozen (since later slides may use this data). The only way to delete information on a saved slide is to click the "RESTART" button on the player -- which begins a new lab report from scratch.
- NOTE: you can return to a previously saved slide to change a response to a question (unless it is a prediction question, which the edit feature is disabled for obvious reasons).
Accessing your Saved Lab Report
As you complete each slide in the lesson, a report is generated with this saved data. When you are finished with the lesson, edit the report with your name and a few comments by following these directions:
- Click the folder icon on the toolbar.
- Select "Lesson List" to reveal the available lessons.
- Find the Lab9-Magnetic Induction lesson.
- Click the "Show Reports (X)" link. "X" will equal the number of times you have used this specific lesson.
- Each report has a time stamp that will help identify the report you would like to rename and use when submitting to Canvas.
- Click on the pencil icon for the report you want to edit. Add your name and any comments. Then click Save.
Exporting your Saved Lab Report for Submission
Finally, prepare the lab report for submission by exporting the report to a few comments by following these directions:
- Find the report you want to submit in the list of lessons (see above).
- Click on the icon to the left of the pencil to save your lesson to your computer. Put it somewhere you can find it, since you will need to select it later to upload to Canvas.
- Go to the destination folder on your computer and make sure it appears where you think you placed it.
- Submit this file like you would any other file submission in Canvas.
Discussion Posting
Use this discussion board to help make sense of your readings and discuss your findings. Also, discuss any changes or substitutions made to the apparatus.
Upload and Submit
Upload your lesson file to the assignment: Lab 9 - Induction IOLab Lesson File Upload