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

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Electronic Principles
Which one of the following phrasers best describes flux density?

The opposition to a build-up of magnetic fields
The force that maintains lines of force
The rate of change of the number of lines of magnetic force
The concentration of lines of magnetic force
None of these

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