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

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

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Electronic Principles
The rms value of a sine waveform is:

the time required to complete one full cycle
equal to 0.707 times the peak amplitude
None of these
equal to 1.41 times the peak amplitude
the number of cycles completed in one second

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