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

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
None of these
an increase in current through the coil causes no further increase in the mmf
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core

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Electronic Principles
The total capacitive reactance of a parallel capacitor circuit is:

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

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Electronic Principles
Doubling the operating frequency of a purely inductive circuit:

increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit
doubles the amount of current through the inductors
None of these
cuts the current through the inductors one-half
has no effect on the current through the inductors

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