Comment: 18:45 - 19:38 (00:53)
Source: Annenberg/CPB Resources - Earth Revealed - 3. Earth's Interior
Keywords: "Michael Faraday", magnetism, "electric current", "magnetic field"
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Our transcription: In the Nineteenth Century it was discovered that a link exists between electricity and magnetism.
English Scientist, Michael Faraday, invented a device that illustrated this principle.
As an electric current is passed through wire, a magnetic field is generated.
The wire moves in a circle following the shape of the field.
The same principle can be observed using iron filings.
An electric current generates a magnetic field causing the filings to orient themselves toward invisible north and south poles.
Faraday went on to discover that moving a magnet through a coil generates an electric current.
Faraday's observations are the bases of our modern views about Earth's magnetic field.
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Geology School Keywords
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