Is an electromagnet a temporary or a permanent magnet?Electromagnets:A permanent magnet is a magnet that retains its magnetion. A small permanent magnet can be used to hold notes onto the door of a refrigerator. Neodymium magnets are very powerful permenent magnets used in hard drives of computers.Sometimes we do not want a magnet to stay magnetised all the … [Read more...] about Is an electromagnet a temporary or a permanent magnet?
Electromagnets
How does an electric bell work using electromagnets?
How does an electric bell work using electromagnets? Electromagnets have a wide range of uses in all sorts of devices. Can you think of some devices from everyday life where we use electromagnets? Electromagnets are used in cranes to pick up cars in scrapyards and also to separate iron from garbage dump. They are also used in loudspeakers, telephones, and in electric motors … [Read more...] about How does an electric bell work using electromagnets?