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A region that has a large number of atoms whose magnetic fields are lined up parallel to a magnet’s field is
A. the magnetosphere.
B. the magnetic declination.
C. a magnetic domain.
D. a ferromagnetic region.

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Magnetic domain

Its speed can be slowed because the magnetic field can be turned on and off, can have its direction reversed and can have its strength changed. However, The speed of a magnetic field that is produced by a current is impossible to be slowed. 

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