Every magnet has two poles : north south


   The poles exhibit forces similar to the forces between electric charges


   Magnetic poles ( monopoles ) can not be isolated


   Electric currents produce magnetic fields (Electromagnet)


   Permanent magnets have permanent magnetic fields (iron) electrons have an intrinsic magnetic field


   Thus, there are two ways of producing magnetic fields.


   An electric current can be produced in a circuit by moving a magnet near the circuit


Electric Fields Magnetic Fields


       The Earth is a large permanent magnet.