magnetism

• magnetic materials:

  • iron
  • nickel
  • cobalt
  • steel
• what happens when like poles meet?

  they repel
• what happens when unlike poles meet?

  they attract
• how to check if a piece of metal is magnetic?

  it should repel a known magnet
• magnetically hard materials?

  those who retain their magnetism once they've been magnetised
• magnetically soft materials?

  those that don't stay magnetic once the outside magnetic influence is removed
• magnetic field?

  region of space where the magnet affect other objects
• magnetic field lines?

  line which show the path that a north pole ending up at a south pole. direction of force caused by the magnet
• closer magnetic fields lines show...

  stronger magnetic field
• induced magnetism?


  when a soft magnet material becomes magnetised after brought near a magnet
• hard magnets are permanent magnets
• soft magnets are temporary magnets
• magnetic field shape:

  we can see it using iron filings

  • place the bar magnet on a flat surface
  • put a piece of card over the magnet
  • gently tap the card
  • the iron filings should line up with the magnetic field