DEMAGNETIZATION

DEMAGNETIZATION

1.     DEMAGNETIZATION is a method of making the magnet lose its magnetism.

Methods that can cause demagnetisation include: –

  • Repeated hammering or dropping of the magnet.
  • Heating the magnet to red hot.
  • Leaving the magnet to rust.
  • Keeping two like poles together for a long time.
  • Putting the magnet in boiling water.
  • Facing the magnet East – West direction for a long time.

KEEPING MAGNETS

  1. Magnets should be kept when unlike poles are near each other.
  2. They should be separated by a piece of wood (insulator)
  3. The two like poles should be connected by a piece of iron called keeper.

USES OF MAGNETS.

  • Magnets are used in the making of loud speakers and microphones.
  • Magnets are used in dynamos to produce electricity.
  • Magnets are used in Electric bells.
  • Opticians and oculists use magnets to remove small magnetic pieces that have gone into people’s eyes.
  • Magnets are used in generators to produce electricity.
  • Magnets are used in Electric motors to produce mechanical energy.
  • Powerful electro magnets are used to lift heavy magnetic metals in factories using cranes.
  • They are used to separate magnetic materials from non-magnetic materials or to pick magnetic materials.
  • Magnets are used in screwdrivers.
  • Magnets are used in compasses to show direction.
  • Magnets are used in telephone receivers.
  • Magnets are used on fridge doors to keep them tightly closed.
  • Magnets are used in kitchens to hold steel and iron cutlery on walls.