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
Current is induced in a conductor that is moving through a magnetic field
Like magnetic poles repel, while unlike poles attract
Current flowing through a conductor generates a magnetic field

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Electronic Principles
Which one of the following statements most accurately applies to the frequency of a waveform?

Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
The actual frequency of a sine waveform is 1.41 times the working frequency
None of these
The longer the period of a waveform, the lower its frequency
The higher the amplitude of a waveform, the higher its frequency

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