Electronic Principles
The total inductive reactance of a parallel inductor circuit is:

equal to the sum of the individual inductance values
equal to the source voltage divided by total current
None of these
less than the inductance value of the smallest inductor
equal to the sum of the individual inductive-reactance values

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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
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

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