iron magnet การใช้

• Such a large value explains why iron magnets are so effective at producing magnetic fields.
• :Yeah-0.9 T is like the best neodymium magnet money can buy-or a really, really big iron magnet.
• The ancient Greeks and early Chinese knew about lodestones that attracted iron, and around the year 1, 000, the Chinese discovered that an iron magnet floated in water always pointed in the north-south direction.
• :: Just a piece of practical advice : wrap the magnet in paper or something for if the iron filings stick directly to an iron magnet it's very difficult to remove it . & # x2013; b _ jonas 22 : 32, 6 September 2008 ( UTC)
• This winding usually served a dual role, acting also as a Jensen introduced the first commercial fixed-magnet loudspeaker; however, the large, heavy iron magnets of the day were impractical and field-coil speakers remained predominant until the widespread availability of lightweight Alnico magnets after World War II.