Magnetism and Electromagnetism
Degaussing is the process of

Remagnetising metallic parts
Removal of magnetic impurities
Demagnetising metallic parts
Removing gases from the materials

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Magnetism and Electromagnetism
A permanent magnet

Attracts all paramagnetic substances and repels others
Attracts only ferromagnetic substances
Attracts some substances and repels others
Attracts ferromagnetic substances and repels all others

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