The magnetic domains rotate, allowing them to line up along the north-south lines of the magnetic field.When we decided it would be safer to keep the magnet in a pocket between takes, people wound up momentarily stuck to the table, a ladder and the studio door. It also adhered itself so firmly to the underside of a metal table that we had to use a pair of locking pliers to retrieve it. Once, the magnet unexpectedly flew out of a videographer's hand and into a dish full of dry filings, which required considerable ingenuity to remove. The magnet didn't just transform our iron-and-oil fluid into a solid - sometimes, its pull on the fluid cracked the petri dish holding it. Along with the petri dishes and iron filings we needed, the Steve Spangler Science catalog had a neodymium magnet it described as "super strong." We ordered our supplies, hoping that the magnet would be powerful enough to create an effect we could capture on film. We wanted to show that a magnetic field could cause certain liquids to behave as solids.
It all started when we went shopping for a magnet for a demonstration on liquid body armor. Spencer Grant/Photographer's Choice RF/Getty Images Iron filings beautifully show off the opposing fields of the same poles of two bar magnets.
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