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Note: This is a continuation lesson from here
Magnets have poles. They are North Pole and South Pole.
- Like poles repel.
- Unlike poles attract.
- Both poles attract all magnetic materials.
We can identify the poles by:
- using a compass
- using an electromagnet
- using free alignment to earth magnetic poles
What happens when you break a magnet?
It will repeat its poles in the same order as the original magnet.
How to store magnets?
Magnets need to be stored safely or it will lose its magnetism over time. We can do so by arranging the magnets in an order to preserve its magnetic field.
Experiments with ring magnets.
This video is a favourable magnetic experiment that shows repulsion between like poles. Also note that gravity caused the gaps to reduce as more magnets was loaded into the experiment.
Electromagnets is a kind of magnet that uses electricity to create a magnetic field using a wire coil. It can be strengthen by using an iron rod within the coil, having more coils and/or using a stronger electric current.
Some uses of electromagnets:
MRI (magnetic resonance imaging)
Magnets can produce electricity.
Machines that uses magnets to produce electricity are called generators.
More information on Magnets can be found here Magnets and Magnetism Pri 4 Science Online Free Guide Singapore.
Watch these videos for more on Magnets: