Electronic Principles
Which one of the following phrases best describes residual magnetism?

None of these
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
The force of attraction between the poles of a permanent and temporary magnetic field
The amount of magnetic flux that is not confined to the core material of an electromagnet
The circular magnetic field that surrounds a conductor carrying a current

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Electronic Principles
A high-pass filter:

passes lower-frequency signals and reduces higher-frequency signals
has no effect on ac signals
increases the level of all frequencies by a significant amount
None of these
passes higher-frequency signals and reduces lower-frequency signals

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