Magnetic Levitation
The people who levitated the frog: http://www.ru.nl/hfml/research/levitation/ And of course, MinutePhysics on Subbable: http://www.subbable.com/minutephysics MinutePhysics is on Google+ -...
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Magnets can be created by running currents through wires, finding a suitable materialthat naturally has all the magnetic fields of its atoms aligned, or forcing the magneticfields of atoms to align.But there's one more kind of magnetism that all materials exhibit, even those whose constituentatoms aren't magnetic - though it's so weak that the other kinds of magnetism often overwhelmit. Basically, an external magnetic field causes the electrons around atoms in a materialto change course, and their new motion generates an opposing magnetic field. This field ispretty weak, but it does cause the material to be repulsed from the magnet a little bit- for example, if you hang a wooden toothpick in a magnetic field, the ends will repel thefield and it wil...
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Magnets can be created by running currents through wires, finding a suitable materialthat naturally has all the magnetic fields of its atoms aligned, or forcing the magneticfields of atoms to align.But there's one more kind of magnetism that all materials exhibit, even those whose constituentatoms aren't magnetic - though it's so weak that the other kinds of magnetism often overwhelmit. Basically, an external magnetic field causes the electrons around atoms in a materialto change course, and their new motion generates an opposing magnetic field. This field ispretty weak, but it does cause the material to be repulsed from the magnet a little bit- for example, if you hang a wooden toothpick in a magnetic field, the ends will repel thefield and it wil...
