physics research

Subject: physics research

What is a magnet?

a piece of iron or other material which has components that have properties of magnetism, such as attracting other iron-containing objects or aligning itself in an external magnetic field.

OR

A magnet is a rock or a piece of metal that can pull certain types of metal toward itself

There are three types of magnets which are:

1 Temporary

2 permanents

3 electromagnets

1. Temporary magnets: these are magnets that easily lose their magnetism.

2. Permanent magnet: once magnetized these magnets do not easily lose its magnetism and can magnetize to a magnetic material for a very long time.

3. Electromagnets: these are magnets that can only work when an electric current pass through it and a soft metal core made into a magnet by the passage of electric current through a coil surrounding it.

Facts about magnets

1. At around 80 °C, a magnet will lose its magnetism and it will become demagnetized permanently if exposed to this temperature for a period, or if heated above their Curie temperature. Heat the magnet even more, and it will melt, and eventually vaporize.

2. When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction. The force generated by the aligned atoms creates a magnetic field. The piece of iron has become a magnet. Some substances can be magnetized by an electric current.

· Magnets always have two poles -- even if you cut them in half

· The most powerful magnet in the universe is actually a star called a magnetar

· Strong rare earth magnets can turn some metals into magnet

· The Earth is like one big bar magnet.

· Iron is an extremely well-known ferromagnetic metal

· Nickel is another popular magnetic metal with ferromagnetic properties

Cobalt is an important ferromagnetic metal