4 апреля 2013, 06:47 (4280 дней назад) № 3235
Неодимовый магнит в медной трубе
Neodymium magnet in FAT copper pipe: «Hedgehog - I am a physics teacher in NY. Any advice on where to find such a large magnet and copper pipe. I demonstrate lenz's law in class, but no where near this striking. Thanks!»