Magnetism and Electromagnetism

Magnetism and Electromagnetism

1. Magnets & Magnetic Materials

   • Permanent Magnets
     • Steel
     • Hard Magnetic Materials
     • Stay Magnitised
   • Like Poles Repel
   • Unlike Poles Attract
   • Iron
     • Soft
       • Magnetised and Demagnitised
       • Easily Changes
     • Attract & pick up other Magnetic Substances

2. Electromagnets

   • Stronger Field
     • Increasing Turns
     • Increasing Current
     • Wrap around Soft Iron Core
   • Electric Bell
     • Pulls arm to hit bell
   • Relay Switch
     • Safety
     • Voltage too high