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

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
the core is permitted to move freely within the coil
None of these
frequent changes in the direction of current through the coil causes heating effects in the core material

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Electronic Principles
The total impedance of a parallel RLC circuit:

None of these
is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
is maximum at the resonant frequency
always decreases as the applied frequency increases
always increases as the applied frequency increases

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