Magnets
- Created by: firegod
- Created on: 17-05-16 11:37
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- Magnets
- Magnets and magnetic materials
- Magnets have a North and South Pole. Opposites attract, and similar poles repel.
- The earth has a magnetic field
- All magnets are metal but not all metals are magnets
- N+N repel, S+S repel, and N+S attract
- Some metals, such as Iron, Nickel, and cobalt are magnetic. Alloys such as steel are too.
- Magnetic force field
- Force fields are invisible, but you can see which patterns they give using metal shavings
- The Earth has a magnetic field
- To magnetise a needle, rub a magnet (North Pole) along the metal, aligning the electrons
- Iron is responsible for the Earth's magnetic field. The south pole of the magnet is the geographical north pole, and vice versa. Magnetic fields are 3 dimensional, not flat.
- To make a compass, you need to magnetize a needle, and then pace it in water on a paper towel. It should point north.
- Electromagnets
- To make an electromagnet, wrap wire around a magnetic metal. then attach it to an electric current. It becomes magnetic
- The more coils, the stronger the electromagnet
- Magnets and magnetic materials
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