mention four uses of a magnet
Answers
Magnets are used to make a tight seal on the doors to refrigerators and freezers. They power speakers in stereos, earphones, and televisions. Magnets are used to store data in computers, and are important in scanning machines called MRIs (magnetic resonance imagers), which doctors use to look inside people's bodies.
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1)Compass -
A compass uses a magnet to direct its needle to the north pole. This is why magnets are said to have a north and south pole. The side that is attracted and points to the north is called the north pole, while the other end is the south pole. Children can easily learn about magnets in a compass by crafting one with a needle, cork and a bowl of water. Magnetize the needle by rubbing it with a strong magnet. Then, place the needle on top of a cork floating in water. It will point to the north.
2)Mag-Lev Trains -
Magnetically levitated trains, known as mag-lev trains, use magnets under the cars to float above the magnetic tracks because the magnets are repelling each other. These types of trains use superconducting magnets and can travel up to 300 miles per hour. Mag-lev trains are used in countries such as Japan. The United States government is working on bringing the technology to America.
3)Vending Machines -
Coins are separated and sorted inside vending machines with magnets. These magnets sort out metal disks or slugs from the real coin money. Also, paper money and checks have magnetic dust in their ink. Vending machines and currency counters check the money for its magnetism to insure the money is genuine
4)Holding Things-
One of the most common uses of magnets is to hold things together. Paper shopping lists and your book report can be held up on refrigerator doors with fridge magnets. The magnets stick the paper to the door with its attraction to the metal in the door. Also, the actual refrigerator doors stay closed because of magnets in the door frames.
5)Electric Motors -
Magnets are responsible for making electric motors and generators work. Moving a metal wire near a magnet produces electricity. Electric generators use steam, flowing water or another source of energy to spin wires through a magnetic field and create electricity. Every time you turn on a light or watch television, you can thanks magnets for helping produce electricity.
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