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--- course_planning:184_projects:s19_project_13 [2019/04/09 16:41] – created tallpaul
+++ course_planning:184_projects:s19_project_13 [2019/04/11 16:30] (current) – tallpaul
@@ Line 17: / Line 17: @@
   * Explain why induced current is different from the current in a circuit (in other words, what does it mean for a current to be "induced"?)
   * Explain why there is a negative sign in Faraday's Law
+</WRAP>
+==== Project 13B: Poop in a Loop ====
+{{ 183_projects:rainbow.jpg?300 }}
+Dramatic events have occurred all over the world as the stormclouds and alien spacecraft have been repelled by what has been described as reverse Hawkion beams. The breakthrough came when it was realized that you must cross the beams in order to disrupt the alien technology. In Lakeview, life has gotten back to relative normality but the town continues to use the magnetic field in order to keep any remaining boar tigers away. There has been the added bonus that there has been a drastic reduction in car accidents due to the populace being afraid that the magnetic field will destroy their engines. However, tranquility is unsettled when the government agency P.E.R.L. comes to town in order to try and capture a live adult EM Boar Tiger. S.P.A.R.T.A.N force has been tasked with acting as a local guide, as P.E.R.L head into the surrounding forest to complete their investigation. Once deep in the forest, your party is ambushed by boar tigers and several of the team are captured and taken away. The remaining members of the team try to follow the tracks of the Boar Tigers but this becomes impossible after a time. However, you remember hearing from Dr. O'Tallest who did research on the boar tigers that their excrement has a very high percentage of nickel in it (it was the colorful poop that kept on being found all over town). You indicate to the group that you think you can McGyver a metal detector together to track your kidnapped colleagues. 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>
+=== Learning Goals ===
+  * Explain how a metal detector works (be able to explain what happens when a metal is present and not present)
+  * On a microscopic level, explain what happens to the metal pieces when placed in a magnetic field.
+  * Make a current vs time graph for the alternating current and for the induced current. Explain any similarities and/or differences in the graphs.
+  * Use the right hand rule to check the direction of the induced current.
 </WRAP>