Magnetism

 

   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.