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Faraday's Concept of Fields

1. Fields are made of filaments in space. The filaments are called "field lines" or "lines of force."

2. Magnetic field lines can be traced with iron filings. Electric field lines can be traced with grass seeds in oil.

3. Energy is stored in field lines. Field lines want to become as short as possible to minimize energy.

4. On the other hand, field lines repel each other. Field lines want to stay as far apart from each other as possible.