Domain Theory and Earth's Magnetic Field
In this second lesson of magnetic fields, we examine a theory that explains why magnetic fields exist. This Domain Theory of Magnetism helps to explain several common magnetic effects such as how to magnetize a needle and why structures in buildings may become magnetized. We then turn our attention to the earth itself and learn about magnetic effects caused by the earth. The earth behaves as though it is a huge bar magnet and this is what causes a compass to point towards a magnetic pole and why a magnetized needle that is able to rotate in a vertical direction may be tilted up or down. The magnetic field of the earth gives rise to the magnetosphere and it is here that charged particles from the sun become trapped and produce the beautiful auroras, or the Northern Lights that we able to observe from Winnipeg. This lesson will conclude our study of magnetic fields.
Watch the following video and make notes on:
Why are magnets magnetized?
What is the most magnetic material?
Give some examples of other materials which can become magnetized. (Note: these are called ferromagnetic materials)
What are magnetic domains?
How does a magnet become magnetized?
What can damage a magnet?
Explain why breaking a magnet in half produces 2 magnets.
Why are magnets magnetized?
What is the most magnetic material?
Give some examples of other materials which can become magnetized. (Note: these are called ferromagnetic materials)
What are magnetic domains?
How does a magnet become magnetized?
What can damage a magnet?
Explain why breaking a magnet in half produces 2 magnets.
While reading the following document make notes on:
Explain Earth's magnetic field.
Explain magnetic declination. Magnetic inclination.
Explain the magnetosphere and auroras.
Explain Earth's magnetic field.
Explain magnetic declination. Magnetic inclination.
Explain the magnetosphere and auroras.
the_magnetic_field_of_the_earth.docx | |
File Size: | 50 kb |
File Type: | docx |
Complete learning activity 6.2.