Description: This demo shows the magnetic field lines of a magnet on the overhead projector.
- bar magnet
- Plastic container of oil and iron filings
- Overhead Projector
- Electric Magnetizer
- Use the electric magnetizer to magnetizer the bar magnet.
- Place on the overhead projector and focus.
- Turn the projector on.
- Place the bar magnet underneath the plastic to visually show the direction of magnetic field lines. You may need to shake the apparatus a little to get the filings to align.
Note: The array of arrows (5G20.30) works better visually.
When using the iron filings in oil, its works better to shake it like an Etch A Sketch and place the magnet underneath.