Observing Magnetic Fields with Iron Filings

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.

THINGS TO TRY

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Contributed by: Enrique Zeleny

Based on a program by: S. M. Blinder

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