Electronic Principles
What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with an inductor that has a reactance of 200 W?

224 ohm
77.7 ohm
89.3 ohm
None of these
88.8 ohm

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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
Like magnetic poles attract, while unlike poles repel
Current flowing through a conductor generates a magnetic field
None of these
Like magnetic poles repel, while unlike poles attract

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Electronic Principles
The north pole of a magnet is the one:

that would be attracted to the earth's south magnetic pole
that would be attracted to the earth's north magnetic pole
None of these
that would be repelled by the south pole of another magnet
that has its molecules arranged in a random pattern

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