Physics Course/Magnet/Permanent ElectroMagnet

Permanent Electromagnetic Magnet
A permanent magnet is an electromagnetic that does not lose its magnetic field when the current is zero

Permanent Electromagnet Properties

 * 1) A magnet has two "poles" namely north pole and south pole.
 * 2) The magnetic field is made up of magnetic field lines that travels from north pole to south pole
 * 3) The magnetic field Strength is the product of the coil's inductance and current. B = L I
 * 4) Magnet of same poles repel; different poles attract