Electronic Principles
What is the smallest number of polarities required for current flow?

Four - two negative and two positive
One - a negative terminal
Three - negative, positive and neutral terminals
Two - a negative terminal and a positive terminal
None of these

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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 flowing through a conductor generates a magnetic field
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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