Category Archives: Magnetic Materials

Superconductor

Demo: EM-G-SC
Pira Index: 5G 50.50

 Lab Equipment  Directions
  1.  Superconductor disk
  2. Plastic tray
  3. Block of styrofoam
  4. Neodymium magnet (.25″ circle)
  5. Plastic tweezers
  6. Liquid nitrogen in dewar
  1.  Set up equipment as shown.
  2. Pour liquid nitrogen on top of superconductor disk
  3. Wait until disk is cooled to liquid nitrogen temperature
  4. Place neodymium magnet on top of disk
  5. Spin the small magnet with tweezers to show that it is floating
  6. Keep disk cooled during demonstration by pouring more liquid nitrogen over disk
This can be shadow projected.

 

Pseudo Superconductor

Demo: EM-G-PS
Pira Index: 5G 50.50

 Lab Equipment  Directions
  1.  Styrofoam container
  2. Large copper disk
  3. Superconductor disk
  4. Small neodymium magnet cube
  5. Tweezers
  6. Large neodymium magnets (set of 4)
  7. 12″ metal ruler
  8. Dewar of liquid nitrogen
  1.  Pour liquid nitrogen over the large copper disk as it sets in the styrofoam container.
  2. Drop large magnet onto copper disk from a height of about 6″.
  3. Drag the magnet (with the small end of the magnet parallel to the copper disk) across the copper disk. Place this magnet on the end of a metal ruler and try to hit the copper disk.
  4. Cool the superconductor with liquid nitrogen on the copper disk and put the small neodymium magnet on top. Using the tweezers, carefully spin the small magnet.

 

Paramagnetism of Oxygen

Demo: EM-G-PO
Pira Index: 5G 30.20

 Lab Equipment  Directions
  1.  Tripod
  2. Holder for 2 neodymium magnets with 2 small metal beads
  3. Metal funnel (closed off)
  4. Foam insulator
  5. Liquid nitrogen
  6. Option: video camera (large) and monitor (show to a large class)
OR Pasco Univ. Incandescent light source (without lens) and HBS power supply to shadow project on paper screen (put tripod on styrofoam block instead of styrofoam background).
  1.  Set up as shown.
  2. Fill funnel 1/4 full with liquid nitrogen.
  3. As oxygen condenses on outside of funnel it will drip down between the two magnets.
  4. Observe magnetic attraction of the oxygen as shown in the diagram.

 

Para/Diamagnetism on OHP

Demo: EM-G-PD
Pira Index: 5G 30.10

 Lab Equipment  Directions
  1.  Pivot base and swing arm
  2. Paramagnetic and diamagnetic sample set of small bottles
  3. Large 1″ neoddymium magnet with handle
  4. Overhead projector
  1.  Place pivot base and swing arm on the OHP with the arm push pin on the pivot base thumblack.
  2. Place two samples on the pivot arm as shown. Focuse the OHP as needed.
  3. Hold magnet very close to a sample but not touching it. There will be an attraction of cupric sulfate and a repulsion of water. Try other samples provided: carbon, rubber stopper pieces, aluminum strips, sulfur, plastic tubing.

NOTE: Be sure the push pin stays on the thumbtack.

Non-Magnetic Iron

Demo: EM-G-NI
Pira Index: 5G 50.10

 Lab Equipment  Directions
  1.  Magnetic wand with small magnet
  2. Tripod
  3. Wire mesh screen
  4. Binder clip
  5. Striker
  6. Bunsen burner
  1.  Heat screen until red hot (figure 1)
  2. Quickly remove the bunsen burner
  3. Touch the magnetic wand to the hot screen (figure 2)
  4. When the screen is red hot, it won’t attract the wand. As it cools, the attraction becomes greater.

 

 

Magnet Paradox

Demo: EM-G-MP
Pira Index: 5G 10.30

 Lab Equipment  Directions
  1.  Two identical iron rods of the same size, length, and cross section. (one magnetized, one not)
  1.  Touch the end of one bar to the middle of the other bar.
  2. If the bars “stick” then the one whose end is touching is the magnetized one.
  3. If the bars do not “stick,” then the one whose end is touching, is the nonmagnetized one.
  4. A magnetized bar is weaker in the middle.

O. H. Magnetic Field Board

Demo: EM-G-MB
Pira Index: 5G 20.30

 Lab Equipment  Directions
  1.  Magnetic model demonstrator
  2. Bar magnet
  3. Overhead projector (optional)
  1.  Take note of the orientation of the various magnetic pointers.
  2. Place the bar magnet on top of the demonstrator.
  3. Note the new orientation of the pointers.
  4. Remove the magnet and observe the motion and eventual orientation of the pointers.