Electromagnet
From Simple English Wikipedia, the free encyclopedia
Electromagnets are magnets that are only magnetic when there is a coil of wire with electricity is running through it. This is called a solenoid. The strength of the magnet is proportional to the current flowing in the circuit. Electromagnets are used for a variety of purposes. In a simple example, an electromagnet can pick up peices of metal, iron, and steel.
Electromagnets can be made stronger by adding more coils to the copper wire, adding an iron core through the coils (for example a nail) or increasing the current.