With this 3-D Magnetic Field Demonstrator, the iron filings are suspended in oil in a sealed acrylic container. Insert a cylindrical bar magnet (not included) into the opening, or two magnets with opposing polarities, and watch the filings line up along the magnetic field lines. View the demonstration directly or with an overhead projector.
The magnet(s) used should be about 10 mm in diameter and 45 to 50 mm long such as our SE-8604 Bar Magnets (2 pack).
The 3-D Magnetic Field Demonstrator has dimensions of 110 x 80 x 80 mm.