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

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

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

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

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