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

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

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Electronic Principles
When a parallel RLC circuit is operating at its resonant frequency:

inductive reactance is equal to the capacitive reactance
inductive reactance is greater than the capacitive reactance
the difference between inductive and capacitive reactance is equal to the resistance
capacitive reactance is greater than the inductive reactance
None of these

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

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

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