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An electrical device (AC or DC) which can generate coer…

An electrical device (AC or DC) which can generate coercive magnetic force for the purpose of reducing
magnetic flux density to zero on storage media or other magnetic media is called:

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A.
a magnetic field.

B.
a degausser.

C.
magnetic remanence.

D.
magnetic saturation.

Explanation:
A device that performs degaussing generates a coercive magnetic force that reduces the magnetic flux density
of the storage media to zero. This magnetic force is what properly erases data from media. Data are stored on
magnetic media by the representation of the polarization of the atoms. Degaussing changes this polarization
(magnetic alignment) by using a type of large magnet to bring it back to its original flux (magnetic alignment).
Incorrect Answers:
A: A magnetic field is not the electrical device described in the question.
C: Magnetic remanence is not the electrical device described in the question.
D: Magnetic saturation is not the electrical device described in the question.

Krutz, Ronald L. and Russell Dean Vines, The CISSP Prep Guide: Mastering the CISSP and ISSEP Exams,
2nd Edition, Wiley Publishing, Indianapolis, 2004, p. 1282


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