Basic Idea:

• Examine Faraday's and Lenz's law for current-carrying coil.

• 7

	What:	How Many:	Where:
The following are left over from last week:
	Wires – 12" (both black or both red)	2	Bewkes 231 (Phys 152 Lab)
	Wires – 24" (one black, one red)	2	Bewkes 231 (Phys 152 Lab)
	Single pole knife switch	1	non-Majors storeroom, shelf P3
New this week:
	New Galvanometer	1	non-Majors storeroom, shelf P3
	Bar magnet	1	Majors storeroom, locked in cabinet
	Compass	1	non-Majors storeroom, shelf JJ4
	Red coils (Use slender coils - see image below)	1 – Larger 1 – Smaller	non-Majors storeroom, shelf P3
	Wire – 48" or 36" (Red)	1	Bewkes 231 (Phys 152 Lab)
	100 kΩ resistor mounted on blue resistor holder (Color code: brown, black, yellow )	1	non-Majors storeroom, shelf P3
The following are set up on the right front bench for exit testing:
	New Galvanometer	1	non-Majors storeroom, shelf P3
	Bar magnets (unknown polarity; ends taped over)	5	non-Majors storeroom, shelf JJ4
	Yellow wire coil (should be in box with red coils)	1	non-Majors storeroom, shelf P4
The following is set up on the movable table:
	Medium-sized Horseshoe magnet (grayish–green)	1	non-Majors storeroom, shelf JJ4
The following are placed on the instructor's bench for a pre-lab demo:
	Styrofoam bar magnet	1	non-Majors storeroom, shelf P3
	Yellow plastic hoop	1	non-Majors storeroom, shelf P3

Notes:

• Lab setup (photo details):
  • Jeff will print 4 copies of magnet warning sign (2 outside lab, one above horseshoe magnet, one on blackboard)
  • If compasses get their orientations flipped, they can be fixed following the instructions on Re-Aligning a Compass Using a Magnetizer
  • Set up a large yellow coil and a galvanometer on front bench for exit testing. Be sure to have 5 magnets with the ends taped over and labeled A, B, C, etc.
  • The DC power panels are controlled by the "big supply" in the storeroom (don't use a small supply on the lab bench); it will be set to around 6 volts. Jeff will connect this supply!

  

   

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• Use red coils, as shown below (do not use the iron core rod!)

  
  Large outer coil; small inner coil (both of our coils are red!); iron core
  Image courtesy Pasco Scientific