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--- course_planning:184_projects:s18_project_12 [2018/04/03 16:42] – tallpaul
+++ course_planning:184_projects:s18_project_12 [2018/04/05 16:40] (current) – dmcpadden
@@ Line 17: / Line 17: @@
   * Explain the general steps that you take when using Ampere's Law.
   * Explain what would change about your solution if the wire were coaxial (this part is extra).
+</WRAP>
+==== Project 12B: Set Your Solenoids to Stun ====
+As the last of the new power lines were assembled, scientists at the Hawkion research facility made a hypothesis that the EM-boar tiger originally tore the lines down because it didn't like the magnetic field that the wire produced. Maybe magnetic field is something Lakeview can use to defend itself!
+Now that the power is back on, the people of Lakeview are itching to get back to using its extensive subway system to get from place to place. Before the town opens up access to the subway system again, Lakeview's general manager of transportation, Dr. Hawk Natkins, has asked you to go underground and make sure everything seems safe.
+You and your team comply and descend into the subway system. You notice a bright blue glow coming from deep in one of the subway tunnels... Yup, it's definitely a pack of hungry EM-boar tigers, ready to munch on a subway car or something. You immediately radio up to Dr. Natkins to see what you should do. He explains that the wiring embedded in the walls of the subway tunnel are arranged just like a big solenoid.
+The tunnel is 1 km long, and Dr. Natkins estimates there are about 8,000 coils of wire from one end of the tunnel to the other. Based on from what you can see right now, the tunnel looks to be about 10 meters wide. Dr. Natkins says that if you can tell him a value for the current needed in the solenoid's wire, he will relay the value to Dr. Cürd over at the power plant, and she will be able to set the current to the desired value. Your job is to figure out what value of current you'd like to relay to Dr. Natkins, and why this will produce a big enough magnetic field to scare off the EM-boar tigers.
+{{ 184_notes:em_boar_tunnel.png?600 |Uh-Oh}}
+<WRAP info>
+===Learning Goals===
+  * Use Ampere's Law to calculate the magnetic field inside a solenoid.
+  * Explain why you pick your Amperian loop and how it helps you simplify your calculations.
+  * Explain the general steps that you take when using Ampere's Law.
+  * Practice using a differently shaped Amperian loop, or figuring out the enclosed current for more than one wire.
 </WRAP>