Electronic Principles
Which one of the following principles best describes the basic operation of an electromagnet?

Like magnetic poles attract, while unlike poles repel
None of these
Like magnetic poles repel, while unlike poles attract
Current flowing through a conductor generates a magnetic field
Current is induced in a conductor that is moving through a magnetic field

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Electronic Principles
A low-pass filter:

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

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Electronic Principles
The total inductive reactance of a parallel inductor circuit is:

None of these
equal to the source voltage divided by total current
equal to the sum of the individual inductive-reactance values
equal to the sum of the individual inductance values
less than the inductance value of the smallest inductor

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