Electronic Principles
A high-pass filter:

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

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

an increase in current through the coil causes no further increase in the mmf
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
None of these
frequent changes in the direction of current through the coil causes heating effects in the core material
the core is permitted to move freely within the coil

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