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

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

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Electronic Principles
The period of a waveform is:

the number of cycles completed in one second
the time required for the voltage to rise from 10% to 90% of the peak amplitude
None of these
equal to 0.707 times the peak amplitude
the time required to complete one full cycle

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