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

frequent changes in the direction of current through the coil causes heating effects in the core material
None of these
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
an increase in current through the coil causes no further increase in the mmf

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Electronic Principles
Which one of the following statements is true for the currents in a series RC circuit?

The current always has the same amplitude and phase for every part of the circuit
The total current is less than the sum of the currents for the resistance and capacitance
None of these
The total current is equal to the sum of the currents for the resistance and capacitance
The total current is greater than the sum of the currents for the resistance and capacitance

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