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Transcript
Magnetism
Grade 11
Objectives
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Students are expected to:
- Define what is magnetism
- Distinguish between a permanent magnet and a temporary magnet
- Show accurately the movement of dipoles in a magnetic field
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How is the iron magnetized?
What does it pick up?
Does it keep the magnetization forever? Explain how it is lost
Questions
Brainstorm
Think of the possiblities in the nature of the substance that will cause it to become magnetized
Activity
Permanent Magnets vs Temporary (induced) magnets
Notes
Dipoles
Questions
What direction are the dipoles pointing when not magnetized?
What direction do they point when magnetized?
How does the domains effect the magnetization of the material?
Exercise
Give the names of 3 materials that are magnetic and non magnetic
Exercise
Homework
- Draw the magnetic dipoles before and after being magnetized
- Explain what is magnetism
- State why non magnetic materials are not attracted to magnets in terms of magnetic domains