Observing Magnetic Fields with Iron Filings
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Sprinkling iron filings on a sheet of paper and bringing a magnet up close to the underside of the paper, we can see that the filings line up along the lines of force of the magnetic field, thus showing its contours.
Contributed by: Enrique Zeleny (March 2011)
Based on a program by: S. M. Blinder
Open content licensed under CC BY-NC-SA
"Observing Magnetic Fields with Iron Filings"
Wolfram Demonstrations Project
Published: March 7 2011