How does an electromagnet work?

Maybe you can "draw" a conclusion from this :

You can make an electromagnet by wrapping wire that has an electrical current running through it around a nail.
When the electric current moves through a wire, it makes a magnetic field. If you coil the wire around and around, it will make the magnetic force stronger, but it will still be pretty weak. Putting a piece of iron or steel inside the coil makes the magnet strong enough to attract objects.
The strength of an electromagnet can be increased by increasing the number of loops of wire around the iron core and by increasing the current or voltage.


http://ksnn.larc.nasa.gov/electromagnet/electromagnet.html

Thanks so much Tex that helped me alot..and the webb site too.