One type of magnet is an Electromagnet, which is a magnet that only becomes magnetic when it is charged with electricity. They usee
Electromagnets are magnetic materials that become magnetic when an electrical current flows through them.
electrically charged particles in motion actually have small electrical currents in them. So if we run an electrical current through a wire, a magnetic field will created around the wire.
Now the strength of the magnetic field can be affected by multiple factors, can one, send more electricity through that wire, you can increase the density of the electrical particles, and you can do this by looping the wire into a coil,
if you were to take the electrical wire and reverse the direction, the electromagnet would also change in direction.
The drastic difference between an electromagnet and a permanent magnet is that an electromagnetic is usually made out of an electrical wire and a coil.
Another difference is that you can change the North and South poles of a magnet, pick up a pile of metal scraps with the North side of the magnet, and then flip the electrical current to put the magnet on the South side and drop the scraps into a bin.
Another difference is that not only the poles can change to help attract and repel, but they can also change in strength, as you need much more magnetic pull to lift a metal crate, but much less to pick up a truck.
Most electromagnetics work with copper, cobalt or other minerals in a coil, and the more wires that coil has, the more powerful it is, so it increases charge density.
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