Magnets and Electromagnetism

Magnets and Electromagnetism

1. Magnets

   • Produce a magnetic field
     • Region where other magnets or magnetic materials experience a non-contact force
       • Iron, steel, cobalt, nickel
         • Force is always attractive between magnet and magnetic material
   • Two poles - north and south
     • Two poles of a magnet near each other, exert a force
       • Attractive or repulsive
         • Two poles same - repel
         • Two different poles - attract
   • Magnetic field from north to south
     • Closer together - stronger Further apart - weaker
     • Stronger at poles of a magnet
   • Two types of magnets
     • Permanent magnets
       • Produce own magnetic field
     • Induced magnets
       • Magnetic materials turned into magnets when put in a magnetic field
     • Force is always attractive

2. Electromagnetism

   • Solenoids
     • Coils make magnet stronger
       • More coils means stronger
       • Less coils means weaker
   • Permanent Magnets
     • Have an electromagnetic field all the time