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.
- Magnets should be kept when unlike poles are near each other.
- They should be separated by a piece of wood (insulator)
- 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.