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

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

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Electronic Principles
For a pure capacitor:

ac current is converted to dc voltage
ac current leads the voltage by 90 degree
None of these
ac current and voltage are exactly in phase
ac current lags the voltage by 90 degree

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Electronic Principles
The rms value of a sine waveform is:

the time required to complete one full cycle
None of these
equal to 1.41 times the peak amplitude
equal to 0.707 times the peak amplitude
the number of cycles completed in one second

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