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Project: Manny's Recycling
Manny Hallabero is at it again! While it appears he took a couple weeks off, he is back to peppering the Lakeview City Council with questions about the new magnetic field surrounding Lakeview. You see, Manny is a dedicated recycling enthusiast and has been collecting discarded wire coils from the Hawkion Detector. Manny was planning a large transport of the coils, along with some spare magnets and power supplies, but he is now concerned. He has constructed a variety of scenarios (though some seem a bit outlandish) and asked the Lakeview City Council for answers. Given your expertise, the Lakeview City Council has asked you to analyze each situation to determine: 1) is there an induced current in the given wire coil and 2) if so, what direction is the induced current?
Bar Magnet Situations
Coil Situations
Challenge Questions: Practice with Calculations & Graphs
Learning Goals
- Use Faraday's Law to determine if there is an induced current
- Draw dA vectors and determine change in flux for a coil
- Use the RHR to determine the direction of induced current
- Identify assumptions to simplify the magnetic flux integral
- Identify steps needed to determine an induced current direction
- Explain the difference between conventional current and induced current
Learning Issues
Timing
Project: Solution
Bar Magnet Situations
The first step for solving these problems is to set up a table that looks one of the tables from theFinding the Induced Current Direction notes:
The next step is to start filling in the table, either row-by-row or column-by-column. Choosing to always have $d\vec{A}$'s point in the same direction as $\vec{B}$ (when possible), results in this table:
Pointing all of the $d\vec{A}$'s in the opposite direction yields this table:
Note: The magnetic field from the bar magnet points from the south end of the bar magnet to the north end.
Coil Situations
more words
Discussion Prompts
- Question:
Evaluation Questions
- Question: