MG.1 - MAGNETIC FIELD

The magnetic lines of force of a bar magnet and a horse-shoe magnet can be shown by sprinkling iron fillings over them. It is clear and easily visible by the whole class when done on the overhead projector. Place the permanent magnets under a thin plexiglass plate (to avoid having the iron fillings stuck to the magnets nor to the projector) and sprinkle iron fillings lightly. The iron fillings align themselves with the magnetic field.