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

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

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Electronic Principles
The peak value of a sine waveform is:

None of these
the amplitude at 1.41 times the maximum value
the amplitude at 90% of the maximum value
the amplitude at 70.7% of the maximum value
the maximum positive or negative value

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