Electronic Principles
Which one of the following statements is true?

None of these
Power dissipation of a pure capacitor decreases with operating frequency
All of these
Power dissipation of a pure capacitor increases with operating frequency
There is no meaningful relationship between the power dissipation of a pure capacitor and its operating frequency

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

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
None of these
The circular magnetic field that surrounds a conductor carrying a current

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Electronic Principles
A low-pass filter:

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

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