Description: A
heavy conducting wire is mounted so that a vertical section of the wire passes
through a transparent sheet of glass. With current from a storage battery flowing
through the wire, iron filings are sprinkled on the sheet and align themselves
to form concentric circles around the wire. The wire gets quite hot, so one should
be prepared to work quite fast. It is usually necessary to tap the glass plate
to reduce friction.
Materials: iron
filings, heavy conducting wire, transparent glass, projector, storage battery