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

None of these
the core is permitted to move freely within the coil
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
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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Electronic Principles
Which one of the following statements is true for the currents in a parallel RL circuit?

The current always has the same amplitude and phase for every part of the circuit
The total current leads the total voltage by less than 90
The total current is equal to the sum of the currents through the resistance and inductance
None of these
The total current is less than the sum of the currents through the resistance and inductance

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