Basic Properties of ic Materials磁性材料的基本性质.doc

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Basic Properties of Magnetic Materials
Equipment Needed
Washer and various metals, compaerials which are always attracted to a magnet are known as temporary magnets.
1. Bring a compass near a washer. Does the compass needle deflect? Does the washer seem to be a magnet?
NOTE: If the washer seems to be magnetized, bang it or drop it several times and test it again. What happens?
2. Now use a permanent magnet instead of the compass. Bring the metal washer near the North Pole of the magnet. What do you observe?
3. Flip the washer over and bring it near the North Pole of the magnet. What do you observe?
4. Does the washer always seem to be attracted to the magnet?
Non magnetic materials
Materials that do not exhibit magnetic properties are known as non-magnetic materials.
5. Bring the North Pole of the compass near a brass ball. Does the compass needle deflect?
6. Bring the South Pole of the compass near the brass ball. Does the compass needle deflect?
7. Now use a permanent magnet instead of the compass. Bring the brass ball near the North Pole of the magnet. What do you observe?
8. Based on these observations, does the brass ball appear to be a permanent magnet, a temporary magnet, or non magnetic? Explain.
Classification of magnetic materials
9. Classify the US nickel, the steel ball, the aluminum ball and one o