permanent and induced magnets

• Bar magnet


  • Has two ends called poles (North Pole and South Pole)
  • Magnetic forces are strongest at the poles
• When two magnets are brought close together


  They exert a force on each other
• Like poles (North-North or South-South)

  Repel each other
• Unlike poles (North-South)


  Attract each other
• Attraction and repulsion between magnetic poles

  Examples of non-contact forces (magnets don't have to touch to experience the force)
• Permanent magnet


  Produces its own magnetic field
• Induced magnet


  An object that becomes a magnet when placed in a magnetic field
• Induced magnetism


  Always causes a force of attraction
• When the permanent magnet is removed, induced magnets lose most or all of their magnetism quickly