Electronic Principles
The peak value of a sine waveform is:

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

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
the core is permitted to move freely within the coil
None of these
an increase in current through the coil causes no further increase in the mmf
frequent changes in the direction of current through the coil causes heating effects in the core material

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