Electronic Principles
Which one of the following phrases best describes residual magnetism?

The circular magnetic field that surrounds a conductor carrying a current
The force of attraction between the poles of a permanent and temporary magnetic field
The amount of magnetic flux that is not confined to the core material of an electromagnet
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off
None of these

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Electronic Principles
Which one of the following statements most accurately applies to the frequency of a waveform?

The longer the period of a waveform, the lower its frequency
Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
The actual frequency of a sine waveform is 1.41 times the working frequency
The higher the amplitude of a waveform, the higher its frequency
None of these

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