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

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

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Electronic Principles
Which one of the following statements is true for the voltage in a parallel RL circuit?

The total voltage is equal to the sum of the voltages across the resistance and inductance
The total voltages is less than the sum of the voltages across the resistance and inductance
None of these
The total voltage lags the total current by less than 90
The voltage always has the same amplitude and phase for every part of the circuit

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

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