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184_projects:metal_detector_24 [2024/02/28 20:38] – tdeyoung | 184_projects:metal_detector_24 [2024/04/12 18:11] (current) – [Main Problem] dmcpadden | ||
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- | ==== Project: Metal Detector ==== | + | ===== Project: Metal Detector |
- | {{ 183_projects: | + | ==== Kick Off Questions ==== |
+ | - What would happen inside a metal if it is placed inside a magnetic field? | ||
+ | - Draw out a sine graph on your whiteboard. What is the amplitude of the graph? What is the frequency? | ||
+ | - What steps do you follow to use the $V_{ind}$ equation? | ||
- | Life has gotten back to normal in Lakeview as the continued magnetic field seems to have driven away the boartigers. | + | |
+ | ==== Main Problem ==== | ||
+ | {{ 184_notes: | ||
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+ | When you dug up Dr. Watersa' | ||
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+ | After eating the jellybeans the EM-boartigers became very friendly, even letting you pet them -- although you got some pretty ferocious static shocks in the process -- and then wandered away. They seem to have completely disappeared, | ||
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+ | Desperate, you turn to Manny for help since he's been right about everything all along. | ||
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+ | {{ 183_projects: | ||
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+ | You have access to a whole bunch of 12 gauge copper wire, an alternating current power supply that can produce a maximum current of 2 A and has a frequency of 60 Hz, and a voltmeter that will measure an alternating voltage. If the voltmeter measures a voltage bigger than 50 mV, it will sound an alarm. You want to design your metal detector so that if there is not a metal nearby, the voltmeter will be below the threshold; however, if there is a metal nearby, then the measured voltage on the voltmeter will be above the threshold and set off the alarm. | ||
<WRAP info> | <WRAP info> | ||
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- | Conceptual | + | ==== Wrap Up Questions |
- | - What is design of a metal detector? (Hint: use your resources - *cough* google *cough*) | + | |
- What would a magnetic field versus time graph and $V_{ind}$ versus time graph look like when there is *not* metal present? | - What would a magnetic field versus time graph and $V_{ind}$ versus time graph look like when there is *not* metal present? | ||
- | - What would happen inside the metal when it is placed inside a magnetic field? | ||
- What would a magnetic field versus time graph and $V_{ind}$ versus time graph look like when there *is* metal present? | - What would a magnetic field versus time graph and $V_{ind}$ versus time graph look like when there *is* metal present? | ||
- If there was a lot of metal near your detector versus a small amount of metal, what would you expect to change? | - If there was a lot of metal near your detector versus a small amount of metal, what would you expect to change? | ||
- What assumptions are you making in this problem? | - What assumptions are you making in this problem? | ||