Electronic Principles
Which one of the following properties of a magnetic circuit can be directly compared to voltage in an electrical circuit?

Number of lines of force
Flux density
Reluctance
Magnetomotive force
None of these

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

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

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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 force that maintains lines of force
The rate of change of the number of lines of magnetic force
The concentration of lines of magnetic force

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