2. Magnetism - the ability of a material to attract
certain metals, results from the motions of
electrons in atoms.
Two poles in a magnet: north pole (N) and a
south pole (S)
3. Solenoid – a current-carrying wire coil that can
pick up certain metal objects, then becomes
electromagnet.
Electromagnets – devices that are made
magnetic by an electric current
4. The strength of an electromagnet depends on
the following factors:
– number of turns in a coil
– current flowing in a coil
– length of air gap between poles
