Overhead Magnets, Iron Filings, Iron Filings in Pop Bottles with Inserted Test Tube, Neodymium Magnets, and Dip Needles.
Overhead Magnets, Iron Filings, Iron Filings in Pop Bottles with Inserted Test Tube, Neodymium Magnets, and Dip Needles.
Overhead Magnets, Iron Filings, Iron Filings in Pop Bottles with Inserted Test Tube, Neodymium Magnets, and Dip Needles.
Overhead Magnets, Iron Filings, Iron Filings in Pop Bottles with Inserted Test Tube, Neodymium Magnets, and Dip Needles.

 

Code Number: 8A70.10

Demo Title: Planetary Magnetism

Condition: Good

Principle: Magnetic Forces & Fields

Area of Study: Electricity & Magnetism

Equipment: 

Overhead Magnets, Iron Filings, Iron Filings in Pop Bottles with Inserted Test Tube, Neodymium Magnets, and Dip Needles.

Procedure:

Place the magnets attached to the Plexiglas on the overhead and sprinkle on the iron filings.  Observe the magnetic field lines.

3-D magnetic field lines may observed with the pop bottle arrangement.

CAUTION: Do not drop the magnets into the test tube as the bottom will break out.

Slide the magnets gently into the test tube.  These magnets may be removed from the apparatus after demonstration with the use of the small metal rods.

Align the dip needle with the north/south magnetic poles of the Earth.  For our location the dip needles should have an angle of approximately 72 or 73 degrees from the horizontal.

References:

  • Christopher Provatidis, "An Easy Way to Estimate the Total Energy of the Geomagnetic Field", TPT, Vol. 62, #5, May 2024, p. 361.
  • Jeanie I. Watt, Bradley J. Roth, "An Elementary Model of the Earth's Magnetic Field", TPT, Vol. 45, #3, March 2007, p. 168.
  • Albert A. Bartlett, "The Earth's Magnetic Field", TPT, Vol. 40, #8, Nov. 2002, p. 462.
  • Ray Ladbury, "Geodynamo Turns Toward a Stable Magnetic Field", Physics Today, Vol. 49, #1, Jan. 1996, p. 17.
  • J. E. Frederickson, "Magnetic field of earth and magnetic dipole moment--and experiment", AJP, Vol. 43, #2, Feb. 1975, p. 186.
  • C. T. Russell, R. J. Strangeway, C. Zhao, B. J. Anderson, W. Baumjohann, K. R. Bromund, D. Fischer, L. Kepko, G. Le, W. Magnes, R. Nakamura, F. Plaschke, J. A. Slavin, R. B. Torbert, T. E. Moore, W. R. Paterson, C. J. Pollock, and J. L. Burch, "Structure, Force Balance, and Topology of Earth’s Magnetopause", Science, Vol. 356, #6341, June 2017, p. 960.
  • Isaac Asimov, "From Pole to Pole", Fantasy and Science Fiction Magazine, p. 142 - 151.
  • Isaac Asimov, "Iron, Cold Iron", Fantasy and Science Fiction Magazine, p. 109 - 118.
  • Kathy A. Svitil, "Mighty Microbes", Discover Magazine, Feb. 1994, p. 25.
  • James Cunningham and Norman Herr, "8.3.7. Geomagnetism", Hands-On Physics Activities with Real Life Applications, 1994, p. 607 - 608, 613 - 614.
  • "Which Way is North?", Facts and Fallacies - Readers Digest, p. 17 - 18.
  • John G. Cramer, "Falling Through to Pellucidar", Analog Science Fiction/Science Fact Magazine, p. 104 - 108.
  • Janice VanCleave, "14. Mapping", Janice VanCleave's Magnets, p. 56 - 59.
  • Jennifer Leman, "The Magnetic North Pole Is Racing Toward Russia", Popular Mechanics, Sept. / Oct. 2020, p. 28.
Latitude, Longitude, "g" and Earth's Magnetic Field Components for Your Classroom
Kathy A. Svitil, "Mighty Microbes", Discover Magazine, Feb. 1994