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

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

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Electronic Principles
Which one of the following principles best describes the basic operation of a generator?

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

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Electronic Principles
The period of a waveform is:

the number of cycles completed in one second
None of these
equal to 0.707 times the peak amplitude
the time required to complete one full cycle
the time required for the voltage to rise from 10% to 90% of the peak amplitude

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Electronic Principles
The peak value of a sine waveform is:

the amplitude at 1.41 times the maximum value
the amplitude at 90% of the maximum value
the amplitude at 70.7% of the maximum value
None of these
the maximum positive or negative value

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