PURPOSE: To visualize the magnetic field around a straight wire.
DESCRIPTION: The magnetic field around a straight wire can be visualized by sprinkling iron filings in the area around where the wire passes through a plastic sheet which is positioned on an overhead projector. Alternatively, small compasses ca n be arranged around the wire.
SUGGESTIONS: This is a portable version; a better choice in Physics classrooms is J5-16: MAGNETIC FIELD AROUND WIRE, LOOP, SOLENOID.
EQUIPMENT: EME magnetic field apparatus with battery electric current source on overhead projector.
SETUP TIME: None.
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