CHAPTER 15. MAGNETISM 15.2
As this only happens close to the North and South poles, we cannot see the aurorae from
South Africa. However, people living in the high Northern latitudes in Canada, Sweden,
and Finland, for example, often see the Northern lights.
See simulation: ( Simulation: VPfkg at http://www.everythingscience.co.za)Chapter 15 | Summary
See the summary presentation ( Presentation: VPfjh at http://www.everythingscience.co.za)- Magnets have two poles - North and South.
- Some substances can be easily magnetised.
- Like poles repel each other and unlike poles attract each other.
- The Earth also has a magnetic field.
- A compass can be used to find the magnetic north pole and help us find our direction.
- The Earth’s magnetic field protects us from being bombarded by high energy charged
particles which are emitted by the Sun. - The Aurorae are an effect of the Earth’s magnetic field.
Chapter 15 End of chapter exercises
1. Describe what is meant by the termmagnetic field.2. Use words and pictures to explain why permanent magnets have a mag-
netic field around them. Refer todomainsin your explanation.3. What is a magnet?4. What happens to the poles of a magnet if it is cut into pieces?5. What happens when like magnetic poles are brought close together?6. What happens when unlike magnetic poles are brought close together?Physics: Electricity and Magnetism 257