Demos: 6A-01 Magnetic Field of Permanent Magnets

Attached to the underside of glass plates are (a) a single bar magnet, (b) a pair of bar magnets with like poles near each other, and (c) a pair of bar magnets with unlike poles near each other. These may be placed on the overhead projector and iron filings sprinkled on the top surface/ Characteristic patterns of lines of force are well demonstrated.

Directions: Place the box on the overhead and refocus the projector so that the magnets are in focus. Using the screen sieve supplied, sprinkle carefully the iron filings onto the surface, avoiding large concentrations in any one spot. Stop when the patterns are well established.

Suggestions for Presentation: One thing you should avoid saying is that the iron filings are actually the lines of force, or that you are observing the lines of force. Lines of force are artifacts and are not in fact separate lines. The iron filings tend to “clump” along the directions of the force lines and give some indication as to the direction and density of the field lines.

Applications:

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