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

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

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Electronic Principles
A high-pass filter:

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

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Electronic Principles
A farad is defined as the amount of capacitance necessary for:

dissipating 1 W of power
changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
None of these
causing an ac phase shift greater than 90 degree
storing 1 V for 1 second

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