Home > Misc > Science: neodymium magnet down a copper pipe

Science: neodymium magnet down a copper pipe

9th Aug 11 (Tue) Leave a comment Go to comments

Coooooool…

The movement of the magnet induces an electric current in the copper and with the electrical current comes a magnetic field, which makes the magnet attracted to it. The magnet doesn’t stick to the wall as it falls because the induced current, and its corresponding magnetic field, are perfectly distributed so that the magnet feels magnetic force equally from all sides.  The magnetic field slows the magnet, but can’t stop its fall because if the magnet stopped moving, the induced electric field would go away and the magnet would start falling again.

~Dan – np: Sunny Day Real EstateDiary

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  1. 13th Aug 11 (Sat) at 9:05 am

    from Wiki: “The greater force exerted by rare earth magnets creates hazards that are not seen with other types of magnet. Neodymium magnets larger than a few centimeters are strong enough to cause injuries to body parts pinched between two magnets, or a magnet and a metal surface, even causing broken bones.[4] Magnets allowed to get too near each other can strike each other with enough force to chip and shatter the brittle material, and the flying chips can cause injuries. There have even been cases where young children who have swallowed several magnets have had a fold of the digestive tract pinched between the magnets, causing injury or death.[5] The stronger magnetic fields can be hazardous to mechanical and electronic devices, as they can erase magnetic media such as floppy disks and credit cards, and magnetize watches and other clockwork mechanisms and the shadow masks of CRT type monitors at a significant distance.”

    I must have at least two of these ASAP

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