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

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

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Electronic Principles
Voltage is

The number of free electrons in an atom
None of these
The flow of charged particles through a material
The smallest electrically charged particle
Trie force that causes electrons to flow

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