Magnetism and Electromagnetism
Degaussing is the process of

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

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Magnetism and Electromagnetism
When an iron piece is placed in a magnetic field

the magnetic field will not be affected
the magnetic lines of force will bend away from their usual paths in order to go away from the piece
the magnetic lines of force will bend away from their usual paths in order to pass through the piece
the iron piece will break

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