An electromagnet in its simplest form, is a wire that has been coiled into one or more loops, known as a solenoid. When electric current flows through the wire, a magnetic field is generated. It is concentrated near (and especially inside) the coil, and the magnetic field lines are very similar to those of a magnet. The strength of the magnetic field of the electromagnet are proportional to the number of loops of wire. That means, the more loops there are, the stronger the magnetic field. In addition, if it is wrapped around a magnetic material, such as an iron nail, then the overall result may be several hundred to thousand times increase in the field strength.
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