This image shows our plastic viewing table with a bar magnet taped to the underside; iron filings can sprinkled on top to outline the magnetic field.
The outline of the magnetic field is made clearly visible by the iron filings but with the viewing table in place, the filings don't are not in direct contact with the bar magnet. Once the experiment is done, the filings can be funnelled out through the notch at the corner.
Best used with Ferrite Bar Magnets.
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