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

The opposition to a build-up of magnetic fields
None of these
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

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

None of these
The total voltage is less than the sum of the voltages across the resistance and inductance
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
The total voltages is equal to the sum of the voltages across the resistance and inductance

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