self-demagnetizing field

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magnet — /mag nit/, n. 1. a body, as a piece of iron or steel, that possesses the property of attracting certain substances, as iron. 2. a lodestone. 3. a thing or person that attracts: The park was a magnet for pickpockets and muggers. [1400 50; late ME… … Universalium
Cassette demagnetizer — A cassette demagnetizer is a device that removes the magnetic charge that is built up from the use of audio cassettes in a cassette deck. Over time, the passage of magnetically charged cassette tape over the metallic parts of the tape deck will… … Wikipedia

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