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What is a magnet
Transcript of What is a magnet
The field lines come out of the North Pole
And the Field lines come in through the South Pole
Diagram of the Magnetic Field in a bar magnet
How are magnets used today?
The History and Development of magnets.
Magnets are used:
For Credit cards which, have a magnetic strip inside them
To Create a bulletin board without the use of tacks, tape, or hooks on walls coated with "magnetized" paint containing metals
To Hang Polaroids of projects-in-process on the lip of a metal shelf above the workbench.
According to Greek legend
magnetism was first discovered by a shepherd when, the iron nails on his sandals stuck to the ground (Lodestone/Magnetite).
Greek philosopher Thales noted that amber attracts feathers and other lightweight materials when rubbed. That was the first historical reference to static electricity.
100 BC (continued)
Lodestones are operated in the prophecy boards of fortune tellers in China.
Chinese astronomer and mathematician Shen Kua reports the use of magnetic compasses for navigation
German physicist Klaus Von Klitzing discovers that when electrical conductors are exposed to strong magnetic fields and low temperatures, their resistance varies in isolated jumps rather than in a smooth, continuous manner, a wonder known as the quantum Hall effect.
By designing a new type of magnets, we can build better generators and electric cars that are far more energy efficient than today.
Therefore we are able to build a rapidly fast car or maybe even aero planes!
Did you know a sewing needle can be magnetized?
Well it can! Here are the steps on how to magnetize a sewing needle
Step 1: Use a straight bar magnet that has a south and north pole to magnetize your needle.
Step 2: .Stroke the needle from one end of the needle approximately 50 times in one direction with the magnet if the initial method is not effective.
Step 3: Test the needle by trying to pick up small iron objects or getting the needle to stick to an iron object, such as a refrigerator door.
Building my own
What you will need.
1 metre of insulated wire
10 paper clips
What to do.
1. Wrap insulated wire around ferrite rod.
2.Connect wire to battery
3. Connect switch to electromagnet
4. Connect battery to switch
5. Test electromagnet by picking up paperclips
Do not keep the electromagnet on for too long otherwise it will get hot and you may burn your hands. Wait a few minutes after disconnecting wires from switch, because the battery gets very hot.
Drawing of my electromagnet
How does my magnet work?
My electromagnet works by running an electric current through the wires which makes the rod magnetic, then creates a magnetic field around the rod. The rod then attracts the paperclips.
By Nadia Raisianzadeh 8G