Basic Idea:

• Measure the magnetic field of a permanent magnet, and straight and coiled wire.

• 8

	What:	How Many:	Where:
The equipment below is used to set up individual experiments, shared by everyone. See the picture for setup location
Bar Magnet Stations (2 setups)
	Small Compass	40 each	non-Majors storeroom, shelf JJ4
	Bar magnet	1 each	Locked in steel cabinet
	Bar magnet paper template	1 each	Print two copies of this template
	Extra bar magnets (place as shown in map below)	6 or 8	Locked in steel cabinet
	Extra Small Compasses (place box on instructor's table)	The whole box	non-Majors storeroom, shelf JJ4
Small Coil Rig
	Small Yellow Coil Rig (mounted on 2×6's)	1	non-Majors storeroom, shelf P4
	Double pole, double throw (DPDT) knife switch (to reverse current)	1	non-Majors storeroom, shelf P4 (with apparatus)
	Wires (Four)	Two 12" - Red & Black One 24" - Red One 48" - Black	Bewkes 231 (Phys 152 Lab)
	Small Compass	32	non-Majors storeroom, shelf JJ4
	40v DC Power supply	1	Majors storeroom, shelf C3
Large Solenoid
	Gaussmeter (F.W. Bell Model 5070) Settings - Units: Tesla, auto range	1	Majors storeroom, locked in steel cabinet
	Digital Multimeter (1 ammeter, 1 voltmeter)	2	Majors storeroom, locked in steel cabinet
	Pasco Air Coil Solenoid (N = 560 turns)	1	non-Majors storeroom, shelf P4
	40v DC Dual Power supply	1	Majors storeroom, shelf C3
	Wires (Five)	Two 12" - Red Three 24" - 1 Red & 2 Black	Bewkes 231 (Phys 152 Lab)
	Plastic Ruler	1	Grab one from front of lab
Square Coil
	Square coil	1	non-Majors storeroom, shelf P4
	Double tap switch (to reverse current)	1	non-Majors storeroom, shelf P4 (with apparatus)
	LabVolt AC/DC power supply (green)	1	Majors storeroom, shelf C3
	Wire (Four)	Two 12" - Red Two 12" - Black	Bewkes 231 (Phys 152 Lab)
	Alligator clips	2	Majors storeroom, shelf B2
	Small Compass	34	non-Majors storeroom, shelf JJ4
Horseshoe magnet - "Jumping Wire Demo"
	LabVolt AC/DC power supply photo (green)	1	Lecture/demo room (Valentine 205A)
	Large horseshoe magnet (1.0 kG)	1	Lecture/demo room (Valentine 205A)
	Wire (Note: this is a special wire for this experiment; see photo on details page)	1	Lecture/demo room (Valentine 205A)
	Tap switch	1	Lecture/demo room (Valentine 205A)
	Small piece of 4×4	1	Lecture/demo room (Valentine 205A)
	Quarters: U.S. & Canadian	Whatever's there	Lecture/demo room (Valentine 205A)
	Wire (12")	1	Bewkes 231 (Phys 152 Lab)
Additional Demo stuff
	Iron filings suspended in silicon oil	1	Lecture/demo room (Valentine 205A)
	Cylindrical magnets for iron filings gizmo	1	Lecture/demo room (Valentine 205A)
	Old computer & CRT display ("Magneto")	1	non-Majors storeroom, shelf LL5

Notes:

• See the photo details page; experiments need to be spread around the room – but not near the computers – so that the magnetic fields don't interfere with each other
  • Place Gaussmeter and extra compasses on instructor's table
  • Caution: The horseshoe magnet is very heavy (48 lbs ≈ 22 kg), so exercise caution when lifting. Remember to bend at the knees!
  • Things for Jeff to print:
    • 2 copies of Bar Magnet B Field Template for the bar magnet experiment
    • 6 copies of magnet warning sign (2 for outside door, 1 for board, 3 for the back wall)
  • If compasses get their orientations flipped, put them in the box marked "backwards compasses". Jeff will fix them following the instructions on Re-Aligning a Compass Using a Magnetizer

• Bar Magnet setup (photos):
  • 2 setups
  • Place 40 compasses on the template, face down (makes arrow direction easier to see)
  • Leave bar magnet off template; students will put their own magnet there

• Small Coil rig setup (photos):
  • 1 setup
  • The DPDT switch is used to easily reverse the direction of current through the coil
    • Connect the wires from the power supply to the color-coded terminals on the side of the switch labeled battery
    • Connect the wires from the coil to the color-coded terminals on the Direct side of the switch
  • Place 32 compasses on the coil rig board, face down
  • Set DC power supply to 3.0 volts

  

   

• Pasco Air Coil Solenoid setup (photos):
  • Use a dual regulated power supply (VDC) to power the solenoid
  • Note that the ammeter needs to be connected to the 20A port (since I > 2A)
  • Two spade lugs should already be attached to the coil, which makes it easier to connect the voltmeter (see photos)
  • Jeff will configure the power supply settings:
    • Set the current to 3.0 amps, which will be at a voltage around 3.0 volts. The current limiter will need to be adjusted to allow this much current
    • Put sticky notes on ammeter and voltmeter

• Square coil setup (photos):
  • Connect wire from positive terminal of power supply to copper wire labeled "UP"
  • A double-tap switch is used to reverse the direction of current through the coil without having to turn the power supply off between groups
    • Connect the wires from the power supply to the color-coded terminals on the tap switch labeled BAT. (Battery)
    • Connect the wires from the coil to the color-coded terminals on the tap switch labeled APP. (I assume this stands for Appliance)
  • Set the range switch to position A (flip the switch up), and set the dial to 5
  • Distribute 34 compasses on foam board platform as shown in setup photos.

• Jumping wire setup (photos):
  • Set range switch to A, set dial to 6

• OLD Solenoid setup (preferred):
  • Use a dual regulated power supply (VDC) to power the solenoid. Set the current to 0.3 – 0.4 A (higher if possible). Put sticky notes on ammeter and voltmeter.

• Alternate Solenoid setup:
  • In this configuration, current for the solenoid is provided by the DC connectors in the lab bench. The DC supply for this lab bench will be set (and wired) by the instructor using the power supply in the stockroom. Set it to the maximum voltage (15 volts or higher); this will provide about 0.2 A of current (connect a multimeter to measure the voltage).