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

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Electronic Principles
The total capacitance of a series capacitor circuit is:

None of these
equal to the sum of the individual capacitance values
equal to the sun of the individual capacitive-reactance values
equal to the source voltage divided by total current
less than the value of the smallest capacitor

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